That depends on what is wrong with it, and who fixes it. If it's a minor problem and you bring it to someone local to you to fix, it shouldn't take very long. If it's a larger or more complecated issues and you send it off somewhere else to get fixed, it will take longer to get back.
If your PS3 is under warranty you can get it fixed for free if you did not do something like spill liquids on it.
8
it depends on how fast both ps3's are
It will take about 3 to 5 days
AGES!
it takes about 6 hours
couple hours
it will take a year or 2
It should not take long, if you are having trouble see related questions answer
Weeks to months.
about 10-20 seconds.
mine has been fixed twice and it usually takes about 2-3 weeks