Plan hours

Every plan includes a pool of monitoring hours.

The "8 hours a night" on each plan is an average, not a nightly cut-off. What you actually get is a set number of monitoring hours for each billing cycle. Sleep nine hours one night and six the next — it all comes out of the same pool.

Plan	Typical night	Hours per cycle
Standard	about 8 hours	240
Extended	about 12 hours	360
Continuous	around-the-clock	720

Each figure is the typical night multiplied by 30 — so a Standard plan covers a normal month of 8-hour nights with room to spare.

What counts

Only time actually spent monitoring.

The clock runs while a session is running. From the moment you start monitoring until you stop it — or it reaches your Max session length.
Checking more often costs you nothing extra. When your mask comes off, the app checks every couple of seconds to be sure before it wakes you. That flurry costs the few seconds it really takes, not a penny more.
Time out of bed still counts while the session is open — the camera is still watching for you to come back.
Nothing counts when no session is running. The app uses no hours sitting idle.

Running out

You will always know before it happens.

At 90% the app shows a heads-up on the home screen and sends a notification.
At 99% the warning turns red and tells you a full night will no longer fit.
Before a session that won't fit, starting monitoring warns you that it will stop early — so you are never surprised in the middle of the night.
When the hours run out, monitoring stops and the alarm stops with it. Your hours come back on your renewal date, or you can upgrade to a plan with more.

You can see exactly where you stand any time under Settings → Hourly Usage: hours used, hours left, and your reset date.