How hard is Boston qualifying time for a 1:30 hm guy

What's your track/xc PBs?

I ran 1:18:50 around the time I ran 2:51:17.

Was hoping to hear that you were 45 or 50.

You ask about a 1:30 HM guy in the title. Then you say you can run a long run progression of 12 miles in 6:40 pace (that is, not at all a 1:30 guy), then acknowledge the discrepancy in saying you'd expect to be "a decent bit under 1:30."

Unless you race your workouts (and absent info like the PBs other posters have asked for), at the moment, you're probably around a 1:20-1:24 HM guy. BQ time will require some training for the distance but won't be terribly hard under good conditions. Beating the cutoff will require a bit more focused training, the kind of stuff that demands a little more attention to detail than you've displayed in the thread. Nice running, though. Good luck.