Corns seem to be pretty hearty in general. I know when I moved last, around May of last year, I had to have my corn in the living room for a while due to lack of space. Between the move and a death in the family I was pretty distracted, I noticed at one point that someone had unplugged my corn's UTH, I'm guestimating that it was at least a week it was unplugged. He was fine. It was very likely not nearly 80 degrees in the house either, I'd guess low to mid 70's. He's safely in our room now and still doing great.