Holy cow, if I walked in and saw my plants "reaching for the sky" like an old west stickup, I'd flip!
They do look just fine though in the second pic... relaxed and relieved. I did not know that they pointed straight up when they're heat stressed like that.
I think you're totally right though, if they've only been exposed for an hour and a half, I'm sure they'll be just fine.
I also think that everyone has forgotten to turn on at least 1 environmental system after a power failure before. Heck I did it on a DWC system once. Several days with no aeration in the water, no cooling in the tent... she was very hot and very sad when I came back, but she sprang back to life when the environmental systems were flipped on again. I'm not sure how long they were off, but I know it was a matter of days as I was out of town for a week when this happened.
I am really looking forward to the results of your mainline effort! The last plant you did like that looked great. I've been interested in the technique, so I'd like to see your progress.
As far as sexing, as you know I am newer around here, so take this with a grain of salt, and perhaps SME or someone else can verify... I was reading Jorges Cervantes this morning on pre-sexing. He states that 4 weeks old of vegetative growth (plant is 6 weeks from seed) is when all plants develop pre-sex characteristics at the 4th to 5th branch internodes. "For males, the pre-flowers emerge behind the stipule at the fourth to fifth branch internodes and generally do not turn into full flowers."
Again, I'm newer and have never sexed a plant from seed, so take that with a grain of salt. Or a half-cup.