Talk:Exhaust/@comment-188.222.106.73-20121123000315/@comment-83.151.36.201-20121129102119

from Movement Speed page:

"Attacking a champion with the Blessing of the Lizard Elder buff when the target is already affected by that slow will reapply the debuff, resetting its duration. It will NOT increase the slow amount. The same holds true for the  Exhaust summoner spell."

Exhausting someone 2nd won't increase the slow/disabling effect.