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It depends for me. If it's a store I'm familiar with and don't expect problems, then about 2 weeks. Otherwise closer to a month. I feel that you just can't be too careful when adding new guys to your setup.
Cool, I'll keep an eye on them. If everything's cool after 2 weeks, I'll add them to the display tank. If not, I'll wait another 2 weeks after I see the last signs of any diseases.
If there are no problems when I get them and no problems after a few days, I do two weeks. If there are problems when I receive them or problems develop, I usually wait 3-4 weeks.