What did you offer?
If you offer rats offer mice, if you offered mice offer rats.
Depending on the animal overall look, whether or not the yolk was fully absorbed or not the time frame before assisting may vary.
Here is what I do, I offer food 3 to 5 days after their first shed, after that I offer once a week. After 3 refusals I offer another prey type.
As far a assisting I generally start to consider it after about 6 refusals. (Granted the animal is healthy and has fully absorbed itīs yolk)