I've been on reserve mostly since Jan of 2010. The most short calls I've ever had was 5 in one month. Most months it's been 3 or less. 7 14 hour short calls is better than 6 24 hour short calls, imo. The seventh short call is only for months when the reserve guarantee is 75 or greater, so I don't mind doing a 7th short call once in a while for an additional 5 hours of pay.