I'm still having problems with this section of code

This is what I want

I have a start time & End Time field. I'm able to calculate the total time. Example project started at 1:00PM and end at 8:00PM is 7 hours.

This is what I need though. Everything after 5:00PM I need to times is by 1.5

So I would have a calculation that does this

1:00PM to 5:00PM is 4 hours
5:00PM to 8:00PM is 4.5

everything from 5:00 to 8:00 is multiplied by 1.5

Thanks