It depends on how fast your body heals, and how long you have had the piercing. The longer you have had the piercing, the longer it will take to close. This is true for all piercings.
It depends on where it is pierced. The lobes can take about 3 months to completely close up, where your cartilage can take 6 months to even a year to completely close up. It also depends on how long you have had the piercing. A piercing that you've had for years can take years to close (in my personal experience).
if its a fresh piercing the hole will close up pretty quickly, if you've had it for a while the hole will probably take a while to close up
a septum piercing never closes completly, sorry
The length of time you have the piercing for will be three times that period for the piercing marks to close up and disappear.
It takes as long as it takes once a piercing has healed it depends on haow long you leave the jewellery out, if you are done with the piercing it can take a few days to several weeks for the piercing to actually close once it's a seasoned piercing (seasoned being over a year old).
It can take up to 12 weeks for an Industrial piercing to close up. Possibly even longer, as long as you clean the area with salen solution it will heal up just fine, DO NOT turn, the piercing it will do that by daily wear. And DO NOT take the piercing out, the skin will grow back together very quickly and cause the punctures to close, meaning you just paid for a piercing, that is no good anymore.
It will take as long as your body needs to close the piercing, we don't all heal at the same rate so just leave it alone and it will shrink down and close when it's ready.
It can vary from person to person, but generally, it can take anywhere from a few weeks to a few months for an ear piercing to fully close up. Keeping an earring in the piercing regularly can help prevent it from closing up quickly.
There isn't a way to tell :/
About 10-15 minutes
If the piercing is 24 hours old it will close quite quickly (generally a few days to knit up), the longer the piercing has been kept with the jewellery in it the longer it will take to heal up. So if you don't like the piercing, get the jewellery out fairly quick and you should be good in a few days.