User blog comment:ObsidianLazarus/Shoutout to Summoner 1,2 and 5/@comment-87.178.250.167-20130114204646/@comment-204.108.96.95-20130114214911

Yes it stacks, frrom 5 to 10, to 15 and so forth by 5 minute increments I believe. And I think it resets after 24 hours. I've no proof of this or any way to say it's true, but it's just my experience with it as I've dodged, then after a good number of hours dodged again and it still stacked.