Bill it by the hour. There’s

Bill it by the hour. There’s no way you can predict with any accuracy how long this project will take: too many variables. Bill for the cost of the VO plus 25-40%.

Based on our company’s editing rates and lots of experiences with projects like this, I would give the client an estimate of $1000 to 1500, plus the VO costs. If you bring it in for less the client will be delighted.