So I had an issue about a week ago when my tent lost power for almost 11 hours. It stunted the flowering autos and stressed my plants a bit but what’re you gonna do. Right now this is where we are at.
They should be ok 
We have crappie electric company and 3-4 times every year a tree falls and we lose power for 1-3 days and never noticed any impact really.
Couple of times it was a few days, by 48-72 hours in the dark they was all droopy and looked very sad. But once power came back on, they perked up ready to go.