I hang my buds attached to stems for 3 days then clip buds from stems and put them into brown paper bags for 2 more days then into the curing jars, of course more days if needed but mine is always 5 to 6 days. Leaving buds attached to the stems will normally cause it to take longer to dry and many will do that purposely.
Sand is correct there are many too many factors. All will depend on temps, humidity level, air flow, etc...