There are really a lot of factor involved rather than giving you a specific time frame
Depends on the weight out of the eggs, whether or not the yolk was entirely absorbed, generally health and look.
I can't give precise advice because those animals are not animals in my possession but I will give you an idea of what I do.
With an average hatchling hatchling out at 65/75 grams I offer food withing 48 hours of their first shed - That's about 12 to 14 days after they hatch give or take.
I start most of my animals on rats if they refuse the first week I offer again a week after that, if it is refused again a try again the following week.
If by the third offering it is still a no go I offer a live mouse if they refuse I do it again the following week and the week after.
Usually 6 to 8 weeks have passed since hatching before I consider assisting of course this is given the weight I originally mentioned, the fact that the animal completely absorb it's yolk, that the animal appear healthy and well hydrated.
It's really about being able to tell for yourself depending on your animal when it is time or not to intervene.
Good luck.