Kentucky warehouses get as hot as Kentucky gets. I'm sure that data is readily available from any number of weather sites. Warehouses typically are located on hilltops to maximize air circulation and exposure to the sun. How long? You should do what the distillers do, periodically open the barrel, withdraw some spirit, and check its progress. How often? That depends on how thirsty you are. Really, it probably depends on how much change you notice. If it seems to be aging quickly, you might want to check it more frequently. It's all part of the adventure.