It can take a while, as I've recently learned too. It's not just TH. It can take a while for gox or any other btc transfer. You have to wait for a certain # of confirmations. I think for gox it's 6. Not sure about the rest.
Generally speaking, I've found TH transfers to be the quickest actually.
I am well aware of the confirmation process - the problem was that it did not seem that they initiated the transfer at all. But eventually it went through.
Normally it's less than half an hour.
We verify large amounts to make sure nothing weird is going on or an account wasn't hacked etc.
If you try to pull a large amount you will probably get a confirmation email.
This isn't written on the site and I'm going to update it right now.