OP, if this is a rando you have no personal connection to, WALK AWAY. Grow a backbone and tell this guy to pound sand. DO NOT be a nice guy.
If you have some sort of link to this person as far as family or friend of a friend, let them know you’re doing 50 images, maybe less idk, and leave it at that.
A month and a half is beyond unacceptable. 2 weeks would have been too long. At this point, I’d had him for the RAWs then find someone on fivver to do the post editing. Sorry for your situation OP