Re: PSN account banned

: As stated above, you should receive an email (on the address used to create the banned account) within 72 hours of the ban, explaining why you were banned, and for how long.  Be sure to check your spam folders, as the email may be accidentally placed in those folders.

If you don't receive an email within 72 hours, the ban is permanent. 

You can contact Customer Service at any time to discuss the ban, especially if you never receive the email explaining the ban.  Sony will not reverse or shorten a ban for any reason other than when chargebacks are resolved, however.