Add up what minutes? You seem to have 20 minutes after 4 o'clock in one
column and 40 minutes after 4 o'clock in the other. Just what "minutes"
are you wanting to add, and how did you come up with 15?

Delbert wrote:

I have a spreadsheet that I would like to add up my minutes. So I have one
column that has 4:20 and the next column that has 4:40, how do I get the next
column to add up the minutes (15 minutes)?

Thank you