You're right, it's probably unreasonable to expect them to be able to grasp the day to day grind immediately, it's just that 2 months later he still wasn't able

You're right, it's probably unreasonable to expect them to be able to grasp the day to day grind immediately, it's just that 2 months later he still wasn't able to work independently and we had to spend a lot more time with him than we expected. We assumed he had enough common sense to pick things up quicker. But no doubt, he's probably smarter than I am and will go further in his IT career.