Epps blues guns every February. They told me they wait until they at least get 100 guns ahead so they get the most of the blueing salts as it is expensive. So if this procedure is still in force yes you will have a long wait. They reblued a Rem 760 that I rebuilt for my nephew several years ago, it was an okay job. They have different grades of bluing and like Guntech states the results are largely dependant on how well the metal is polished and prepared. I did not request they further polish of the 760 as it was to be a utility deer hunting rifle, it just needed to look good not stupendous.
You can try Precision Arms in King City Ont. Steve has reblued an OU shotgun for me years ago and did a very nice job.