I also love many synthetics, do not misread me, but...

Wool is cool because actually you don't have to wash it!! At least not during a trip of less than a month, unless you wear the thing A LOT. Also, unlike many synthetics, it doesn't pick up smells so much.

This being said, even when washed, I'm surprised at how fast they dry. I'm not talking about the big bulky wonderful marvellous Guide Sweater here but about things like lightweight wool layers. When I take them out of the washing machine they're almost dry already (after the "gentle" spinning cycle). Of course, a lot of the synthetic stuff will be totally dry at the same moment...

Your mileage may vary...