Its not about how many days it takes.. curing is a lot like cooking, it takes experience.. you cant just put a set time limit on the drying before that day actually comes. I am never completely happy with my cures, yeah I get a smell, and it does smell good, but I always try to aim for that double bag funk. One thing I will say I have noticed however, is when I left some popcorn nugs on some stems in my basement just for an experiment, it had a much better overall smell and texture to the bud. the only real differences I could think of environmentally is the temperature; it stays around 65 F almost all the time, and that they were on stems.
I seriously think Curing is probably THE hardest thing about the whole process mainly because like I said earlier, it is so much like cooking. I have never used Hygrometers for curing, I have seen the post on here about it and it interests me a lot. ( With school right around the corner, I don't have the cash to fork out for like 9 hygrometers ) Try finding a cooler spot to do your initial drying process and even the cure possibly. Hope this helps somewhat.