Ive cashed out of Players Only, Full Tilt, and Pokerstars
, and all were really quick. Players Only and Full tilt both needed identification documents, but after those were accepted only took a couple days. They all took about the same time. My first Pokerstars check took a couple days longer, but the 2nd was within 3 days. Full Tilt also within about 3 days and I think this was because it was the same payment processor that sent the Pokerstars checks.
* I forgot Bodog
which also wasn't slow I know I had the check within 1 week, maybe I just have good luck.