Sorry for the late reply! I figured out how to get out of the game without closing it, so the lack of a pause isn't as big of an issue.
Besides that, I timed how long it took me to get from the 425-435 point, and it took an hour even while being conservative with exercise and never hitting flu/bills. It seems to me that things start to get really slow like this around the 320 point. I understand you aren't working on the game anymore, but I though you'd like to know.