This varies from perosn to person and also how long you have had the piercing. Never remove a piercing for more than a few minutes if it is less than a year and a half to two years old, simply as a precaution. If it is old enough the best way to check is to remove your piercing in the morning when you get up and periodically (every four hours) slip the jewelry back in and see if it's stiff or still loose. If it stays loose throughout the entire day add an hour or two to how long the jewelry is out. If you can go 16 or more hours without it getting stiff I would then leave it out over night (your body heals better at night when you are resting) and try to put it in first thing in the morning. If it's stiff then you know what you should not leave it out overnight, but during the day. This is the best way I can think to do this as it works VERY well for new (but old enough) piercings and stretched piercings.
After 6weeks you can take it out.
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.
Depends on how long you've had it, what gauge it is, and how your body heals.
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.
It varies, if you have had the piercing for a long time the hole might never close. It does vary, i got my ears pierced over 3 years ago and still close overnight.
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.