I usually run 6-9 miles 2 times per week and then throw in one run that is 12 or so miles. I typically run 3 times only but sometimes 4 depending on the overnight and a bunch of other logistical things. Im running a few halfs coming up and would like to get the Boston done next year but for now im just staying ready for the halfs.
As for running overseas when it was 120+ I found that once acclimated I would run at 4-5 am or so because it was only 90 degrees or so and it felt pretty good.