Need help calculating hours and minutes in a rolling 24 hour period with "If/Then" also

First of all, you don't write

Formula:

=F3+F4+F5+F6+F7+F8+F9+F10+F11+F12+F13+F14

because there is a SUM function where you write

Formula:

=SUM(F3:F14)

Same for other.

Second, I don't understand. You did get 13 hours as result?