Unless one is starting to smell with that rotten egg smell, there is no need to stop them. You can always give them more time.
Some of my eggs are pretty hard to see inside they are so dark shelled. The blue/green ones are the worst. I normally candle after 7 days and mark which eggs I think are good or bad, but leave them in. I next candle when I go into lockdown. I’ll remove the clears then. Occasionally I find I was wrong at Day 7.
That’s why I advise patience. It would be quite upsetting to open one early and find a live chick just because of impatience. As you gain experience with your eggs and your candling technique and equipment, you’ll be able to make better decisions. But as long as one is not starting to smell, you don’t lose anything by giving them more time.