Yeah, you have enough time in the day to do everything you do, but time turners are terribly tricky things, aren't they? You wind up messing up something, and it results in a catastrophic accident. Or not (you aren't sure of anything anymore, oops).
Granted. It is wired in to a broken generator though, so you cannot go out with it and you cannot generate electricity with it because the generator is broken. Bummer. It would have been nice if you can create electricity by riding the bike.