I don’t think it’ll be incredibly detrimental if you hold them after two days, but ideally I’d give it another day or two. I can’t claim to be an expert on snakes by any means, by I did come into frequent contact with red tails at a place of internship a few years ago, and my vague memories tell me that they were more squeamish and easily stressed then some of the other boas and pythons we had on a regular basis. Again, I want to stress that snakes are not my forte, so I may be wrong. You should probably try to contact an expert, knowledgeable keeper or a breeder for advice. But I, personally, like to err on the side of caution, especially when the health of another being is involved. So I would give him a couple more days.