I just used 30, because that is the time frame he threw out. 10 also seems like a small window though.
Not really. It gives you an idea who has been the best recently, and 10 years is a pretty big window.
The teams are:
LSU
OREGON
FLORIDA STATE
STANFORD
WISCONSIN
OKLAHOMA
CLEMSON
BOISE STATE - NOT SURE THEY COUNT
OHIO STATE
ALABAMA