Personally I would consider calculating the time it takes to make said video and then price it accordingly.
Most of our projects take about a week or two all-in. Even a 2 hour shoot will require at least a half of a week worth of planning – preparation – shooting – handling footage and editing – and revisions and delivery. Really darn near impossible to do the quickest of videos from start to finish in even 2 days. More like 3 or 4.
So ask yourself about how many projects you can produce and what you need to charge to keep the lights on.