13, unfortunately. I started in January of 2012, and my last 1-gallon was December 30. I changed the airlock yesterday, and I'll rack to secondary on the 11th. I'll probably taste in March, during which time, I will have brewed another gallon batch. I'm going to return to 1-gallon batches for a while, because I'm trying to go to original recipes only. If I fail with a gallon, I'm out $15 (most of which is hops). If I fail with five, I'm out $75 (most of which is hops). If I succeed with one gallon, I'll transpose for five.