This is mostly a hands-off project, and as such it's probably not appropriate to bill for your time. As you noted, you spent more time than you should have since this was a first run. Presumably you will be more efficient for future runs and the client shouldn't have to pay for your inefficiency this time around. Indeed, billing for your time gives you an incentive to make mistakes and have to fix them rather than getting it right in the first place!

I would bill by the minute of footage, with a certain minimum amount to cover materials and setup. Maybe something along the lines of $20 for the first 10 minutes, $25 for each half-hour, $40 for each hour, whichever is less. Obviously you should choose your own prices that make it worthwhile for both you and the client.