if the lights were on for 12 hours and off for 12 hours, you will initiate flowering after 2 weeks or there about.
if your light are on for 16 to 24 hours a day you will get growth.
so 7 minits added to or tken away from what ??
give me an example of how long the light hours that have 7 minits added or takken away fromwhat?
not that 7 minits will martter eigher way, your good to carry on