that is a good Ratio in recovery time. Normally Tabata is 20 secs to 10 secs recovery. so 1 min hard work to 15 secs recovery is very good.
It's also the quickest I can get my feet out of the rower's stirrups and get into position on the Airdyne. It takes exactly 10 minutes to complete the tabata and I am wiped. Rest for a minute and hit it again.
All the while, trying to watch Sports Center, of course.