Counting Only Specific Hours Between Two Times

thanks again for another test
i looked at your file, and from what i saw, i still got errors here. dont know if it is something with my version of windows or office, or just the language of both. im still getting errors on my file, it seems that the options i need are very hard to cover 100%
ill add i file to show what im working with, maybe that can help,
also got a new error, saying that "Negative dates or times are displayed as ########"
we work on every possible times, so we can start and finish at any time, with any time length, anything from 1 hour jobs to 16 or more hour jobs, even going from 1 day to the next. dont need to be able to calculate over 24 hours though