Does the off time setting adds a set delay between layers or do you have to include the platform going up and down then add your delay? If the first is true I will set it to 2 seconds if not I will make it 14 seconds, but when I set it to 14 second the print time is going haywire (14 seconds is the value that I use in the chitubox).
The delay time is intended for delay time after exposure, excluding movement times those are calculated.
Some machines allow you to specify this and pass with the print profile, for others it is fixed in the machine firmware and the delay time is just editable to get a correct print time estimate.
Hope that helps,