The reason for the salt rock is because its a natural dehumidifier. I tend to leave all the cuttings intact (fan leaves and all) while drying to make the drying as slow as possible.
The salt rocks at the bottom keep the humidity down and the fans keep clean air moving though to prevent mold.
I trim off the extra once 80-90% dry to the touch. Then they go into mason jars that get buds turned and jar burped every other day for the few weeks.
Burped and turned every other day first week.
... every 3 days 2nd week.
and once a week on 3rd week.
After that I don't have to touch it anymore and I leave it alone (unless I'm smoking it)
.
My total dying/curing time is about a month and a half before its ready to smoke.
But that's just the method I use.
Just remember the slower you dry it without getting mold , the better the smoke will be.
If you do get something with whitish mold, don't smoke it!