How mutch for architectual archviz work

Lets say a real estate company wants to hire you for a archviz project and you know how mutch time evrything takes. How do you charge them?How mutch per room?Or lets say size of the project? Do you charge them for the entire project,per hour or how many seconds the sequence is?

Your lump sum fee will be based on your raw rate, multiplied by total hours, multiplied again by a range of multiplier to cover the overhead cost, add contingency, exclude tax, then add whatever profit margin you are looking for.