Removing lunch hour from Log Sheet. (Removing Specific Hour duration)

Hello!

Been trying to workout a formula that would remove the lunch time duration from the logsheet total off or leave duration. But it's not a standardized -1 hour.

What i mean is:
Lunch hour is from 11:30 to 12:30

Example 1 : Out: 11:00 In: 12:15
So, leave duration should be 30 minutes.

Example 2: Out 11:45 In 12:45
Leave hours should be 15 min.

Example 3: Out 09:00 In: 12:50
Leave hours should be 2 hours and 50 Minutes

I would appreciate the help as I'm still trying to figure out how to correctly make it work.