Tentatively shooting for ~105 miles during June.
I previously got reasonably far into following
this plan, but I got burned out, though I find that the basic structure of the plan still suits me well (at least moreso than a bunch of other online charts), so I'm loosely following that structure week to week.
The TLDR is that every 7 day cycle is {3 days running, rest day, 2 days running, rest day}. Almost all runs are done at an easy pace, with a "long run" every 2 weeks, and the start of every week features speed work (either intervals or a deliberate "do this at your 5K/10K pace").
Per that schedule, my next "long run" should be 15 miles, but I think that's a bit too aggressive for me right now (though I could probably pull it off given optimal weather conditions and optimal sleep). So I'll probably make my next long run closer to 13 miles.
Haven't done much examining of heart rate or anything else, though I did follow loco's thread closely when he was providing more frequent updates. Right now I'm content to simply put in the miles and let any progress develop naturally from that.