You’ve only wasted the 4 hours if you didn’t spend them doing something else.

At 50/50 it’s an ok bet if the debugging time is much less than the total human time, even if the loops are long, you might rather 4 hours of deep work on an important human thing or on just relaxing vs babysitting the LLM. Assuming that about half the time that will pay off with a correctly done thing with very little effort, it’s kind of amazing.