So the company you works at wants to pay people to make them money. When people start at a new job there's often a ramp-up time until they become productive and usually a second period until they're stable enough to lead others, but if someone is stuck in that negative efficiency state then it is something you should pass up the chain. If you're an experienced dev who is spending four hours a day holding the hand of someone new to the company that's an investment but if it's still going on months later then your manager will want to help the situation so that you can use your own time productively.

It's a hard situation and I've been lucky that I haven't been stuck with anyone who can't overcome that initial learning phase, but if you find yourself there you should try and unload the problem to people more HRy and save yourself the stress.

(All the above, BTW, is not to imply that one-person rockstar programmers are a thing (they aren't) and skills vary, I am only talking about extreme scenarios)