IF function in time values

I'm trying to work out how to create formula, to give me value "Yes" or "No" depending on value in certain column. I tried IF function =IF(F2>15,G2-E2,"Yes") *15 is meant to be minutes. If I add 00,15 it doesn't seem to work.

To be more specific, I would like, column to display Yes or No if order been processed in less or more then 15 min.

And then colour it Green,Red, for yes or no. But that's should be easy in condition formatting.

As it's in a time scale, I can't really get it to work.

Time values are a fraction of a day. To convert to the number of minutes, multiply by 60 minutes per hour and 24 hours per day.

=IF(F2*60*24>15,G2-E2,"Yes")

EDIT:

To show Yes or No:

=IF(F2*60*24>15,"No","Yes")