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It depends on where I get them from, LFS or a chain store like Petsmart. If it's my LFS usually 1-2 weeks. Chain store, sometimes upwards of 4 weeks. Since our QT tank is a 5.5, QT'ing can be a chore, but worth it.
Honestly, I don't QT my fish when I add them to my tank. I've never had a problem with this.
The reason is simply that I'm not aloud to have a million tanks set up, just one small tank.
I acclimate my fish carefully for 20 minutes and that method seems to work fine.