If you use the ResMed brand, maybe you can try this to see the Clinician settings.
ResMed S9 CPAP Setup
Maybe they put in some funny numbers for the "therapy" time.
If you don't have ResMed, do some Google searching to see if you can find how to get into the Clinician settings on your brand.
I have been using the ResMed S9 Elite with humidifier for over a year now and it has helped me to sleep better and not be tired later in the day.
ResMed... and the mask I use is the Swift FX nasal pillows
Swift FX. Very comfortable and I didn't have any problems adapting to the mask.
Here's a link to supplies.
CPAP Machines and CPAP Masks for the Treatment of Sleep Apnea
For the machines and complete masks, they will need your prescription on file. But parts of machines/masks do not need prescription. Go figure.