^^^yep agree. On this grow, I've had several interruptions of the light schedule and my plants don't seem bothered. I think some strains might be very sensitive.
As I understand it, MJ plants care about the length of the dark period, not the light period. If the light goes off and they are in darkness, I shut the light off until the next scheduled 12hrs of light. That way they will get a very short light period but a long dark period.