I'm not sure exactly what your asking but here goes.

I don't know of anyone who has flown 85 hours on reserve, at least recently. By that, I mean inside your awarded reserve days. The last month I did reserve I got about 30 hours of flying (2 trips). I'm not sure how representative that is.

If you want to pick up open time on your days off then yes, 85 hours is possible and should be relatively easy to do based on the open time we've had lately.

YMMV