I found significant improvement after the first couple weeks. I think I kept it up for a month or so.
I've found a super simple trick to completely eradicate scabies. It's safe, inexpensive and extremely effective. Niacin! Buy 500mg's of the flushing kind of niacin and take one right before bed. Both my girlfriend and I used this to quickly kill our scabies. I was re infected, and used it again to quickly defeat them again. This after 6 months of trying everything else.
Borax your clothes on hot. Clean your space thoroughly. Clip your nails. Buy a sulfur cream (also very effective at control but not eradication) and use it on the bites daily to keep them in check. But Niacin is the thing.
Be aware, 500mgs of FLUSHING niacin can be very uncomfortable. It is recommended not to take it on an empty stomach and it makes most people feel very warm. I believe it is this flush that creates the efficacy. We took it before bed so that we were asleep before the discomfort arose. You will be amazed how easily this works. Please repost after curing yourselves to that this becomes common knowledge and people don't have to suffer with these evil little mites!