If your customers are happy to accept that sort of waiting list... fine. However, eight weeks wait for a wedding video is simply too long.

As Mark says, you have to be switched-on when you're filming. You're getting too much raw material, learn when to press the "record" button and when not.
If you are the camera operator and the editor, you should go into the edit suite knowing what material you have. You don't have to digitize all the material, only the bits you need. Then allowing one week (40 hours) to edit and your video should be ready the following Saturday.
If you're not too sure of your editing skills then you might allow two weeks for editing.

If it takes you three weeks (120 hours) to edit a one hour wedding DVD, then you should consider getting a proper editor to work for you.

You asked the question, how long to deliver a professional wedding video to customers and the answer is that it should be ready for them when they return from their honeymoon two, or at the most, three weeks later.

An English wedding isn't any easier than an Asian wedding, if you know what you're doing. If you're going to be a professional then don't have excuses... have results.