Every pro movie needs 75 minutes of preparation at the lake house.
You got to write a general script which needs 15 minutes. Here you select settings, temper, ethnics and chose a writer who produces a script. Then this script has to be filled with positions (some kind of scratch book) which can give bonus combinations (search forum for further details). This is done in additional 60 minutes.
Finally you receive a score for your script/writings and can start filming (again making settings, assigning actors and actresses and a director). Here you got to complete 5 scences. The duration of a scene depends on your genre. Higher paid genres need more time.
When you have done the 5 scenes you will receive a final score for your film (should be above 8.0 to make some profit, 9.0 and more is good) and you can promote and sell your film.