how far into the grow did you switch your lights to 12 / 12?

my 4 (big bud) seedlings will be going into the tent on next week. I'll run the light 16/8 for the next few weeks. However I'm away for a weeks holiday come week 6. I was wondering should I switch to 12 / 12 for that week I'm away to play safe in case they run too long or should i hold off changing the lights until i come back?

(this is my first time, in case you hav'nt guessed)
topcat_121 Reviewed by topcat_121 on . FINISHED !!! :) ;) :rasta: Rating: 5