if you can extend drying times to 7-14 days, it's probably the "right" temperature. some terps that add flavor and aroma can evaporate quickly at fairly low temps. (evaporation is always occurring, even below boiling point... want an example? go look at an icecube tray 2-3 months after you put it in freezer. the cubes don't get smaller through magic... in this case it is called "sublimation" and not evaporation, but same damn concept, really... 'constantly striving for equilibrium with environment')
you know it's too warm or too dry if it is bone dry in 2-3 days... this will impact the buds in a noticeable way, ime. i've had some dry in 4-5 days that tasted no different than a slower dry. So... your mileage may vary. you can almost fee a difference in the plant material when it dries fast... pop a bud on a radiator or something and come back in a few hours, you'll see what i mean. it even breaks up differently.
as slow as you can go without growing microbes...