Depends on if you bid first or last out. As a reserve FO in DC I've flown 18 hours in a month bidding last out (plus picking up a 7 hour trip in open time for 125% pay, for a total of 25 hours) and 35 hours in a month bidding first out. The same month I bid last out, someone in my class blocked 49 hours without picking anything up in open time. YMMV. DC reserves get a lot of simple turns. Not as many trips...but DC is the most called out base.