Help. Too much light in flowering cycle.

My plants are nine weeks into flowering and my timers failed. they've had 20 hours of light instead of twelve. It's my first grow and I'm clueless when problems arise. i started flushing yesterday and the timers failed last night. they've been in the dark now for 6 hours. i was wondering how long to have them in the dark and also how much damage I may have done. Your help as always is most appreciated.

Not much you can do but at 9 weeks they will be ready soon.
Just put it back to the same lighting schedule as soon as you can,
I wouldn't mess it about anymore and keep it to a one off mishap.

Just get a new timer and continue with the flowering cycle. A day or two is not enough to revert your plants back to pre-flowering. This has only slowed down the flowering a couple of days. Set the timer the same as the first nine weeks of flowering ( I assume this was 12/12)

yeah the less change the better at this point. just put it back on reg schedule as soon as you can and keep on course. much like humans, sudden unforeseen changes cause stress to plants.