Telekinesis - Skyrim

Hello! I was recently playing Skyrim and I set out for the hunt on the spell: Telekinesis
I realize that I have to go to the Labyrinthian, but I need a key. To get the key I must do Winterhold College assignments but all I am asking is: about how long or how many missions will it take until I acquire the key to the Labyrinthian?

If you havent done any of the quests from winterhold i'd guess 3-6 hours depending on difficulty.

Labyrinthian was such a pain in the ass for me, I got kind of bored of that quest. Though iirc, the telekinesis spell is in the first room you enter.

Thanks to both of you.