iRobot Roomba - Manual (Page 9)

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Cleaning Modes
Roomba will clean based on the cleaning mode you select. Roomba has up to
four cleaning modes, depending on your model:
Clean Mode (all models)
Roomba automatically calculates the room size and adjusts its cleaning time
appropriately. Roomba may clean for up to 60 minutes.
spot Mode (all models)
Roomba will spiral approximately 3 feet in diameter and then spiral back to
where it started, intensely cleaning a localized area.
Max Mode
Roomba runs until its battery is nearly depleted, up to 120 minutes.
scheduled Cleaning Mode
When a cleaning time is programmed with the iRobot Scheduler Remote,
Roomba enters Scheduled Cleaning Mode. When Roomba is in Scheduled
Cleaning Mode, the status light blinks amber. At the specified time, Roomba
leaves its Home Base, cleans for up to 60 minutes and returns to the Home
Base to recharge when it is done.