Get him on rats ASAP, they get harder to switch the longer they are on mice, and you would need quite a few mice to feed an adult royal.
But at that age I would say small weaner rats, or possibly a bit smaller. Is difficult to say because snakes grow at different rates, so giving us the size of the royal would be more helpful. =)
The food should leave a little bulge in him, but if it leaves a very large lump, he is regurging, or is getting a bit overweight, then it is too much.
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