I just got my nose pierced and it was done too low so I took it out 2 hours later how long should I wait before going to get it repierced a little higher?

Well you can get it done right away, I am hoping you are getting it done by a real body piercer and not some joker with a piercing gun, who clearly doesn't know what they are doing. Now as for placement the piercer should take a whole lot more care in placement, being too low doesn't sound right for an experienced professional body piercer. So it it was done by a novice piercer ask if they have a more experienced piercer on staff who can fix the screw up. I am just going to hazard a guess that you didn't do this your self and you know better than to be doing some thing that requires skill and training.