How long should I leave my beer in the primary?

I made a 2.5 gallon batch of an ipa (OG: 1.072) on Friday night. I used a wyeast smack pack that was 9 months old so I created a yeast starter 4 days in advance. The yeast starter picked up in a couple of days. I decanted the yeast starter and pitched it into my 70 degree wort Friday night. Fermentation started in about 2 hours after pitching the yeast and my fermentation temperature was 70-72 degrees throughout the primary fermentation process. It has been less than 48 hours and my beer fermented out completely. I want to dry hop my ipa and I usually dry hop my beer for only 2-3 days. I would also like to dry hop sooner than later because the of more CO2 left in my fermenter now as compared to in 5 days from now (I want to limit as much oxygen exposure as possible). The only problem is I go out of town on Wednesday and won't be back in town until the beginning of next week. Would dry hopping today and then bottling on Wednesday before I go out of town be too short of time for a beer to sit in a fermenter? If I did this, my beer would have only been in the primary fermenter for 5.5 days. Would this not be enough time for the yeast to clean up after itself? Would I just be better off dry hopping for 9 days and then bottling at the 2 week mark to give the beer more time to clean up after itself?

I would not think that it is totally done yet. You may be at FG but it is accepted that the yeast will use a few more days to clean up off flavors that are naturally produced during fermentation. I also think you will get better results if you dry hop longer. 5-7 days. So I would wait to do the dry hop when you return.

My minimum with dry hopping would be 10 days primary and 5 days dry hop. My usual is 14 days primary then 5 to 7 days dry hop. Unless I get lazy then it is longer.

Yes, 14 days in primary seems to be a good number for me too. Sometimes less, but by the 14th day, it's usually all finished up. Safer to wait.

If you're at FG I'd say throw your dry hops in Wednesday before you split then bottle when you get back. If you're not at FG by Wednesday I'd just leave it be till you get back.

Usually go 3-4 week in primary w/out looking at it til I'm ready to bottle.

Dry hop for at least 5 days and sometimes I cold crash after that.

No rush to bottle.