I never charge for how long I am there!
One thing I do different than many others is I am there as long as you are. If your day starts at 8am, so does mine, if it ends at midnight, so do I. I charge based on the length of the video and never my hours (most charge for a 4hr/6hr/8hr package). That way you don’t have to decide what’s more important to you, the beginning, middle or end. You also don’t have to worry about missing any footage. If you remember something happening during the wedding that may not have made the video, odds are I have it and can revise your video to try and include it! Because I was there the entire time!
One thing to keep in mind is I am typically a one-person crew. I can always bring on an addition videographer for certain parts of the day to double up and make sure more is captured as well as multiple angles. As a single shooter NOT every moment will have been captured at every angle so if there are additional funds, I can hire more shooters to make sure all the best angles are captured!