I have a work sheet with start times (all in military time) and total
minutes (in the format of 120 = 2 hours). I need to figure out what
the stop times would be.

For example:

Start time: 08:00:00
Total minute: 180 minutes


The stop time would be 11:00:00, but I cannot figure out a formula to
calculate this. There are obviously much more complex start times and
total minutes that will make this a chore if I cannot find a solution.

Thanks in advance.