First off, let's take a look at bObsweep, bObsweep PetHair and remote buttons:
You have three options to set bObsweep to clean the house:
Auto-cleaning mode: In this mode bObsweep cleans until his battery falls below 15% and then starts looking for its charge-up station. Simply press AUTO on the remote or press PLAY/START button on the robot vacuum.
30-minute timed cleaning mode: In this mode bObsweep works for 30 minutes; this is enough time for cleaning a large area like a living room or a studio. To put Bob in this mode, press the PROGRAM button (it's the second button from left on bObsweep).
15-minute timed cleaning mode: If you like bObsweep to clean a bedroom, kitchen, or bathroom, you can put him to clean in this mode. Press PROGRAM button until the number 3 shows on the screen; press START button.
Here is a video demo that explains the whole thing. The video features bObsweep; with the comparison figures above, it should not be hard to figure out how to do the same thing on a bObsweep PetHair robot vacuum cleaner.