Critical Purple "Auto" North Eastern U.S

They do everything a photoperiod does, but faster. How? Think of it like this: a photo strain that does 4 week of veg (18 hours light schedule) and 8 week of flower (12 hours if light schedule) will have a total of 4*7*18 + 8*7*12 = 504 + 672 = 1.176 hours of light to power it's whole growth and bloom. Now an auto strain doing 20/4 light schedule will get, during a 8 week grow cycle: 8*7*20 = 1.120 hours of light. Roughly the same amount of light to power its growth, but 4 weeks faster. Usually the seedling / veg stage of autos lasts 3 weeks, then you get 2 weeks of stretch and 3 to 4 weeks of bloom stage. Depending on how much light the are getting they can take a few more weeks.

If you've just gave the plant a good watering then I wouldn't be too worried but lesson learned and you'll be ready next time around. Its very noticeable that your plants under went heat stress simply be seeing the curl on your leaves. If its announcing to be a hot day make sure to water in the morning and then simply make sure your soil is moist throughout the night and repeat as necessary.