When you use weed to make ghetto edibles it is really hard to guess how much THC they contain.
Also as I said it takes about an hour for them to kick in unlike smoking when they hit almost instantly.
These 2 factors make it really hard to guess the amount you should eat.
Fortunately for this guy. You can't really die from overdosing on weed since it doesn't affect the parts of your brain that are responsible for breathing unlike hard drugs.
He is in danger tho. He could throw up and since he can't control himself he could choke on the vomit.
Also he should expect at least good 20 hours of sleep after taking this much.