How Many Hours a Day Should You Use an Oxygen Concentrator? (Can You Use It 24/7?)

By Yashil Bhatt, RRT, Licensed Registered Respiratory Therapist (Georgia & South Carolina) and owner of My Respiratory Company, serving Augusta, Evans, Aiken and Columbia, and shipping nationwide. Last updated: October 28, 2026.

Quick answer: Most people prescribed long-term home oxygen need to use it at least 15 hours a day, including while sleeping. Some need it 24 hours a day. A concentrator is built to run for long stretches, but your hours and flow rate are set by your doctor's prescription, not by how you feel on a given day.

If you just started home oxygen, the first question is usually simple: how many hours a day do I actually need to use it? The honest answer depends on why you were prescribed oxygen, what your oxygen levels look like at rest, during activity and during sleep, and what your doctor ordered. As a respiratory therapist, I hear this question every week. Here is how to think about it.

What Is Long-Term Oxygen Therapy?

Long-term oxygen therapy (LTOT) is the prescribed use of supplemental oxygen for many hours a day, usually for chronic lung conditions such as COPD, pulmonary fibrosis or other causes of persistently low blood oxygen. An oxygen concentrator is an electric medical device that pulls in room air, filters out nitrogen and delivers oxygen-enriched air through a nasal cannula. Unlike tanks, it never runs out as long as it has power.

Oxygen Hours at a Glance

Prescription type Typical hours When it is used
Continuous 24 hours a day Low oxygen at rest, with activity and during sleep
Long-term (LTOT) 15+ hours a day, including sleep Chronic COPD with low resting levels
Nocturnal During sleep only Normal while awake, low during sleep
Exertional During activity only Normal at rest, low with walking or exercise
As needed (PRN) Short term Illness or flare-ups, as directed by your doctor

How Many Hours a Day Do You Need Oxygen?

Clinical guidance for long-term oxygen therapy in chronic lung disease is built around a minimum number of hours, because the survival and quality-of-life benefit is tied to how many hours oxygen is used. Patient guidance from major health systems commonly states that most people need supplemental oxygen at least 15 hours a day, and some need it around the clock. Hours should include sleep, because oxygen levels often drop further at night. For details on the exertional type, see our guide to exercising with an oxygen concentrator.

More hours is generally fine and often beneficial. Using fewer hours than prescribed is where the risk is. If you are on LTOT, do not cut back because you feel fine. Feeling fine is often the oxygen working.

Can You Use an Oxygen Concentrator 24 Hours a Day?

Yes, if your prescription calls for it and the machine is rated for continuous duty. Stationary home concentrators are engineered for round-the-clock use, such as the VH-3 Home Oxygen Concentrator (1 to 5 LPM, 24/7 duty rated). Portable units can also be used for long periods when plugged into AC or DC power, but battery life is the limiting factor away from an outlet.

Typical battery runtime varies by model and setting. Single-battery portable units commonly last roughly 2 to 6 hours, and double-battery configurations roughly 5 to 13 hours. Higher pulse settings drain batteries faster. Our comparison of portable vs home oxygen concentrators explains when each one makes sense. Wondering whether a concentrator or a tank is the better fit for you? Read Oxygen Concentrator vs Oxygen Tank: Which Is Better for Home Use?

Do You Need Oxygen While You Sleep?

For many patients, yes. Oxygen levels commonly fall during sleep, especially in COPD, and if you also have sleep apnea the drop can be larger. If your prescription says continuous, that includes nighttime. Pulse-dose portable concentrators do not work for every sleeper or every flow requirement, so ask your provider whether your device is approved for sleep. See our COPD and home oxygen therapy guide for more.

What You Should Never Change on Your Own

  • Do not raise your flow rate unless your doctor or respiratory therapist tells you to. In people with CO2 retention, too much oxygen can be harmful. Learn more in What LPM Oxygen Flow Rate Do I Need?
  • Do not shorten your hours because your numbers look good while wearing oxygen.
  • Do not smoke or allow open flames near oxygen. Oxygen does not burn on its own, but it makes fire burn hotter and faster. Keep equipment away from heat sources and use a water-based lubricant, never petroleum jelly, on your nose.

How to Know If Your Oxygen Hours Are Working

  1. Check your SpO2. A fingertip pulse oximeter lets you confirm your level on oxygen. See SpO2 levels: what is normal and when to call your doctor and our home pulse oximeter buying guide.
  2. Watch your symptoms. Morning headaches, daytime sleepiness, confusion, blue-tinged lips or fingertips, or more shortness of breath can mean your oxygen is not adequate. Call your doctor promptly.
  3. Keep the machine healthy. A dirty or failing concentrator may not deliver the oxygen purity you need. Follow the home oxygen concentrator maintenance schedule and call your provider if the device alarms.
  4. Have a backup plan. Keep enough battery or backup oxygen for a power outage. This matters in storm and outage season across Georgia and South Carolina.

Power, Cost and Travel Considerations

Running a home concentrator nonstop adds to your electric bill. As a simple illustration, a unit that draws 300 watts for 24 hours uses about 7.2 kWh a day. Check your model's wattage. If you plan to fly, review the FAA rules for portable oxygen concentrators. If cost is your concern, see Medicare vs paying out of pocket for oxygen therapy.

Where to Buy an Oxygen Concentrator

If you need to buy oxygen equipment, My Respiratory Company is owned by a licensed RRT and can help you match a device to your prescribed flow rate. We ship nationwide and serve Augusta, Evans, Aiken and Columbia locally. Browse by what you need:

RRT-recommended equipment

Not sure which fits your prescription? Book an Oxygen Therapy Education session or a COPD Education session with a licensed RRT, see our respiratory services, or call 706-772-0263. Learn what a respiratory therapist does.

Key Takeaways

  • Most long-term oxygen patients need at least 15 hours a day, including sleep. Some need 24 hours.
  • Concentrators can run continuously, but check that yours is rated for it and keep backup power.
  • Never change your flow rate or cut hours without talking to your doctor.
  • Track SpO2 and symptoms, and keep your equipment maintained.
  • Oxygen is a fire hazard: no smoking, no open flames.

Frequently Asked Questions

How many hours a day should you use an oxygen concentrator?

Follow your prescription. Most long-term oxygen patients need at least 15 hours a day including sleep, and some need 24 hours a day.

Is it bad to use an oxygen concentrator all day?

No. If your doctor prescribed continuous oxygen, using it all day is the goal. Stationary concentrators are designed for continuous operation.

Can I use oxygen more hours than prescribed?

Extra hours at your prescribed flow rate are generally safe. Do not increase the flow rate itself without medical direction.

Can I sleep with an oxygen concentrator?

Yes, and many patients need to. Confirm with your provider that your device and flow setting are appropriate for sleep.

How long does a portable oxygen concentrator battery last?

It depends on the model, battery size and setting. Roughly 2 to 6 hours for a single battery and 5 to 13 hours for a double battery are common ranges.

What if I only need oxygen sometimes?

Some people are prescribed oxygen only for exertion, sleep or illness. Use it exactly as ordered, and ask your doctor to retest your levels if your symptoms change.

When should I call my doctor?

Call if you have worsening breathlessness, confusion, severe drowsiness, morning headaches, bluish lips or fingertips, or if your SpO2 stays below the target your doctor gave you. Call 911 for severe breathing trouble.

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Medical disclaimer: This article is for general education and is not medical advice. Your oxygen prescription, flow rate and hours are set by your healthcare provider. Always follow their instructions and call 911 in an emergency.