I have beer in my primary fermenting in my basement, which is cooler then anywhere else in my house, with a brew belt, to keep it at a decent temp. The last time I did this particular beer kit it 2.5 weeks to get to a decent OG to bottle w/ out the belt. In the instructions of the belt it said not to have the belt on longer then 8 days. What should I do since I assume it will take like 18 days??