The last game I played, TB was able to stun me (as Sedna) while I tried to lock down a portal, and my locks were useless for 2 minutes at least.
Why so long? I've never played as TB so I don't know if he has a 2 minute long stun ability, or if that was a possible favor item I'm not familiar with, but it seems way OP. I've had heals stunned for 30 seconds or more as well.