Ordinarily when bObi finishes her work, she will stay on her charging station until you ask her to clean again.
However, you can tell bObi to clean right after charging by activating her "Finish Fueling and Go" feature.
To set bObi to back-to-back cleaning cycles, press the SCH TIME button on her remote. The time on her remote's screen will flash.
Press the STOP button, and the time will read FF GO.
Press the SCH TIME button once more, and bObi will start working every time her battery reaches full charge.
Press SCH TIME again, then STOP, and bObi will return to her regular cleaning schedule.