User blog comment:Udyrthegreat/ My Buffs for Outclassed champions/@comment-5425051-20120819121810/@comment-4834593-20120819154942

^So if TF does it from the moment Shen uses his ult, and as fast as he can each time again, it takes 731 seconds to come off cooldown, as I calculated before. This time.

That means Shen has 12 minutes and 11 seconds without ult.