Few years back I had one very stubborn hatchling, did not want to eat on it's own.
6 weeks after her first shed I attempted to assist her, this was a failure and had to force feed.
The following week she was assisted at least this time she made the effort to swallow the prey on her own which was a good sign compare to the previous feeding.
I than thought a few weeks of that regimen and she would get the idea and start eating on her own sadly it was not the case with her I had to assist her for 6 months before she finally got the idea.
While the majority of hatchlings I assisted were only assisted for 3 to 4 times before starting eating on their own she was a special case.
The question here is how long should one persevere and when should one give up (I actually was close to give up on her when she decided to eat on her own.
Now how long should you assist or when should you give up? That sadly no one can really answer for you it will be your decision (never an easy one, but at some point one that might need to be made)
In my case this animal in question has made amazing progress, she is now 2 years old has caught up with her sibling and amazingly has one of the most aggressive feeding response out of the rest of my animals.
I know this does not really help but it give you an idea of what sometimes you can expect.