Shedding takes as long as it takes, not "5 days" as someone told you. And it takes longer if they just ate. Because both digestion and shedding requires extra hydration (water) from the snake's body, so if they're doing both at more or less the same time, it just got slower. Snakes don't watch the calendar, neither should you.
Ok thank you, that makes sense, but what should be the longest before I should do something or be concerned