If you have a nostril piercing less than six months old, the hole can close inside the nostril in as little as a day or two, meaning that you might have to re-open it yourself, or go to your piercer again to get the hole reopened professionally.
Herein, will my nose piercing close up overnight?
If your piercing is fresh, it can close up in a matter of minutes. If you’ve had it for less than a year, you can expect it to close up within a few hours or days. The inside of the hole can close up rather quickly, even if you’ve had the piercing for years.