Assuming that just one person is using the electric toothbrush and you are following the recommend practice of brushing twice a day for 2 minutes at a time, most Braun Oral B and Philips Sonicare toothbrushes will run for 1-2 weeks before needing to be recharged again. For hints and tips on how best to look after your electric toothbrush and to maximise its lifespan take a look at our electric toothbrush care guide here.