Oh I hope he/she makes it! I hatched some ducklings a few years ago, and one got stuck. I waited and waited, finally had to help her out. She had been stuck for so long that her butt took the shape of the egg, and swung off to the left side. It stayed that way forever, so her name became CB for "crooked butt".
She flopped around in the 'bator for about 8 hours before I felt comfortable moving her to the brooder.
That hatch 5 of 11 eggs hatched (ill gotten eggs from a cemetary flock of easter chick drop-offs... non-setting Pekins, I went every day to look for eggs just sitting on the ground!) and EVERY one of them turned out female.
So then I saw an add on CL for a free male duck who thought he was a poodle. Had been raised with dogs! I took CB with to keep him company.. he'd have none of it! So I put him in the travel crate and CB rode with me, sitting on the passenger seat with her head draped over my arm. She turned out to be the best pet duck EVER.
I hope your's makes it through alright! But you can't wait too long, I'd give it a week tops. CB only took a day to act 100% normal besides her crooked toosh.