Light

Nothing to worry about at all! Nothing you could do about it in any event so relax! And btw, I only grow autos and I only grow them under 24/7 lights because I can't keep the temps up any other way and it hasn't affected any of my ladies. The grow I'm doing now, I have to pull the buds away from the light 'cause I can't raise it any higher without unzipping the top of my tent off and I don't particularly want to do that... these ladies don't mind anything I do! Definitely going to grow it again!

You have an autoflower in most recent diary, so it is of no consequence besides fewer photons hitting the plant in a day (DLI). insignificant relative to 3-4 months of time. i wouldn't use a 24/0 cycle though. Fewer hours is fine and as long as intensity goes up proportionally to match, it is even providing same DLI. While "dark processes" happen in the light too, it's good to give the plant a rest. there may be some contexts where given equipment and size of grow area where 24/0 is 'better', but it really would just mean you need a slightly stronger light to maintain equal or better DLI with fewer hours of use and realize benefits of dark period for the plant.

Ah, nah it's nothing to worry about pal. I ran a few hours over and lights were off for around the same time once in wk 6 for around 13hrs. Once won't cause any issues. Just skip that lighting period or when you turned it back on after the 12 hours use that as your marker and turn off whenever your normal light cycle stops. Happy growing.