IGNORANTLY?????
Say WHAT ? ! ? ! ? !!!!
Pray tell... WHERE did you hear such a thing?
As for how long it takes to dry a load.
Well that depends on how many you're drying, what GSM and the like.
For me... I tend to wash and dry at least 25~40 at a time. Drying takes a LOT longer than washing.
Unless you have a thermonuclear dryer... even high heat isn't going to hurt your towels.
Medium is what you should be using, on even the most delicate towels imho.

Then again.... what do I know about towels.

I mean, ME? Microfiber TOWELS? Shhhhhh... say it ain't so. :laughing:
You'll more likely end up with worse towels from tumbling them around wet and never drying them than actually getting them dry and moving on.