It really depends on the type of piercing and long you've had the piercing.
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).
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).
a septum piercing never closes completly, sorry
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
After 3 years chances are good it wont close, the piercing will shrink but not close completely.
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 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 depends on where the piercing is. If it's in your nose then if will take a couple hours to close; if it's in your ear then probably a day or two.
Well if you have had the piercing that long it won't close, however it will shrink over time. The mark left by the initial piercing will remain in place and will look less noticable over time.
Its called a labret piercing. The time that you can leave the piercing empty varies from person to person.