Actually i play a Stealth archer. and I did no "boosting" so to speak. i just used the other skills for awhile i played as a mage warrior and thief to get the other very few skills i had left to 100. and i maxed out with normal gameplay at about 150-200 hours of gameplay.
Two things about this.
1.) If you are a stealth archer, why are you two-handing/using heavy armor/using destruction magic so much that it gets to 100? Breaks the RP for me, which is why none of my characters will ever reach 81. They stop around 50-60 and all the skills I actively use are maxed.
2.) It takes more than a little while to get a skill to 100. It actually takes a pretty damn long time. I've had all my characters reach at least level 40 until their primary combat skill (1-handed, 2-handed, destruction/conjuration) reached 100.