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It depends how many skill points you get.
and that depends on your style of you play
PvP players and dungeon crawlers get more than
those who just roam about.
As a fact...about 45% of all sky-shards are in dungeons
and 45 or so are in Cyrodiil
So you see..it is difficult to answer your question outright
But than...the question on my mind is...why do you wish to max all skills out?