I brewed my 2nd batch this weekend. It was an extract kit, and I rehydrated my yeast this time. My water for the yeast was 90deg, let it sit for 15 min, stirred and let it set for another 15-20 min before I pitched it. My wort was 70 when I pitched it, I cooled it to 58 by the next morning (14hrs) but didn't mean to go that low. I started bringing the temp up slowly to 65. Over that time fermentation started sometime between 30-36 hours, which I understand isn't a big deal especially given the low temp. But, my airlock has gone completely silent within 36 hours after that. Did I mess up, anything I should do? Thanks for any advice.