had a character that was played through all editions. each edition would convert it over (usually losing many levels in the process). finally retired the character last year. you don't even want to dream about the characters level...
28 years of gaming. several sessions weekly....
hahahahahaha.
oh yeah, the character had been male, female, cursed, saved, dead, undead, ascended, damned, redeemed, insane, monsterous, powerful, weak, spellcaster, combatant, criminal, crusader, mercenary, teacher, lost, found, planar, friend, enemy, celebrated, reviled, defender, destroyer, infernal, celestial, bestial, misnamed, nameless, accused, aquitted, feared, fearful, fearless, arrogant, humbled.... but always fun to play. giving up the character was hard, but the dm's council was a'callin.
in our group, we have actual campaigns (and make some use of others) and generally, it takes about 18-24 months to go from level 1 to epic. however, in our campaigns, permanent death/destruction is always a possiblity. we also run epic campaigns. we have some really high level characters and some really good players and dm's.