Minnesota coach Jerry Kill announced his retirement on Wednesday because of health reasons.

Kill has epilepsy, and has missed time on the sideline in the past to get treatment. He suffered two seizures on Tuesday but still went to practice, then decided later in the evening he would take the advice of doctor's and step away from the game.

"Last night, when I walked off the practice field, I feel like a part of me died," Kill said at a news conference Wednesday. "I love this game. I love what it's done for my family. I thank God for giving me the opportunity to coach this game."

Kill has a record of 156-102 as a college head coach and was 29-29 with the Golden Gophers.

Minnesota named defensive coordinator Tracy Claeys as interim coach, the third coach to land an interim job in the Big Ten Conference this season. Bill Cubit took over for Tim Beckman at Illinois the week before the season started, and Mike Locksley took over for Randy Edsall at Maryland earlier this month.

That got us thinking about the other coaches in the conference and how long their tenures have been at their respective schools. Here is a list of the Big Ten coaches listed according to their tenures at the current programs - from shortest to longest.

Big Ten football coaches by tenure GALLERY

The hire dates listed are from this article by footballscoop.com, which listed the hire dates for all 128 FBS coaches prior to the season.