How far does it go on one charge?

Edit: having read it again I've realised that it's a joke; as soon as you turn the drill on it's just going to rip the duct tape and spin while the bike stays still. I just don't believe it will go at all, so the concerns about losing the back brake are irrelevant.

Hope this doesn't contravene the 'be nice' policy, not very positive is it.