That depends, on a lot of factors. You already noted that these are the recommended suspension lengths; ♦ moderators can deviate from them and issue shorter suspensions, or go for the maximum length the first or second time already:
Depending on the severity of the problem behavior — and at the complete discretion of the moderator — your account will be placed in timed suspension for anywhere from 1 to 365 days.
(source: A Day in the Penalty Box)
People can change a lot in a year, which is why longer suspensions are rare. (Almost) everybody deserves a second/third/fourth chance.
Generally speaking, people's main accounts are not deleted (but sockpuppets might be); it's easier to keep track of them that way. A network-wide suspension can only be issued by Community Managers and are reserved for the most egregious cases.