MWS time
Co-pilots typically get less time than their AC/IP counterparts for one simple reason...they are the least flexible crew qual. Co-pilots are only good for students on training sorties or co-pilots on operational sorties.
As an AC/IP, you get used more, because your experience allows you to fly more demanding missions, you don't need another pilot with a higher qual to fly with you, and as an IP you can fly instructional sorties too.
C-21 copilots typically log about 200-300 hours their first year. After that, it picks up because most folks are upgraded to AC after a year to a year-and-a-half. AC's can typically fly about 400 hours a year, and IPs generally log about 500-600 hours a year.
In a 3-year tour, a C-21 pilot will generally log about 1,000 hours or so of C-21 time...about 300 of that will be as a copilot, the rest as an AC/IP.
Other Heavy MWS's are about the same, although most of those folks fly more because they are in more demand due to OIF and OEF. Some of those guys get 600-800 hours a year.
I'm an IP right now, and I've been averaging about 40-50 hours a month currently. Last month (October) I flew about 38 hours, but that was because I was at IP school, and half the month was spent flying local sorties, which are shorter (3-4 hours). This month I flew about 42, and again, that's because this last week I'm spending it TDY in Dallas for the simulator.
Fighters and bombers, expect to fly less...about 200-300 a year on average is what I typically hear. You'll probably fly a similar number of sorties compared to heavy pilots, but your sorties are typically much shorter. A C-21 mission can net you about 5-8 hours in a day, versus a couple hours in a fighter.
Of course, there's nothing like flying a 5-leg, 14 hour duty day and log only 3 hours of flying time....those days suck. Take off from Maxwell, get to Eglin in 0.6. Spend an hour on the ground. Take back off, fly to Macdill, log a 0.8. Spend another hour on the ground. Head out for Jacksonville FL, and log another 0.5. Spend another hour on the ground. Go to Atlanta, log about a 0.7, and spend 2 hours on the ground due to it being busy. Head out from Atlanta, fly back to Maxwell in 0.8 hours. Long day...and you only logged 3.4 hours, yet you spend about 5+ hours on the ground.