Talk:Swain/@comment-10977589-20131017203431/@comment-8506165-20131018002951

6 seconds would bring it into line with 's ult, which is the only AoE damaging toggled ultimate I know of. I think all the formswitching champions have a 6 second cooldown on their toggles too though.

So yeah, seems reasonable to me. Don't think it'd entirely prevent the situation you describe though. :P