Personally, I think it depends on the climate you live in. A slower, longer drying time is generally recommended; 7-10 days has worked well for me. In a very humid climate you could trim all the leaf material you want and still achieve a slow dry. In a hyper-dry or arid climate, a soda-can sized bud could dry to a crisp in under 3 days. Bud that dries too quickly doesn't smell or smoke as nice as slower dried stuff. Because I live in a very dry climate my drying process is as follows:
(With a humidifier running full time in the drying cabinet) I chop and hang the plants upside down, whole and untouched for 48 hours. Then I do a first trim chopping all the fan leaves and largest bud leaves and rehang for 6-8 days. Then I do the final trim chopping all the leaf material I can stand to remove in one sitting then the bud gets packed into glass mason jars for curing.
Hope this is helpful.