I air-dry my baselayers (hung on hangers on shower curtain rod in mostly unused guest bathroom), to avoid the fabric softener sheets I use in the dryer (which impair the brethability of base layers). I did a comparison a year ago–results based on what I own:
Fastest: Capilene 2
A little slower: Capilene 3 and 4
A little slower yet: REI MTS midweight and Patagonia Merino 1 (actually 30% nylon)
Slowest: Smartwool equivalent of Capilene 2.
Interestingly, though, the Smartwool feels dryer even when still damp!
I also did a test of socks several years ago, Smartwool vs. Thorlo, same weight: The Smartwool were dry over an hour before the Thorlo. This really surprised me, based on my experience with other wool vs. synthetics. I gave up Thorlo after that, especially since the Smartwool for me are more comfortable and feel more comfortable even when wet. It also helps that the Smartwool socks have imperceptible seams over the top of the toes, which I need because of my hammertoes. I plan to check out a couple other brands of meriono wool socks which I understand wear longer, but a lot depends on how those toe seams are constructed.
Merino sheep are amazing animals! They used to be in minimal demand because their wrinkled skin makes them hard to shear, but their wool is #1!