User blog comment:Xyclone010/Ekko - Kit Guessing/@comment-26389270-20150511093623/@comment-5828368-20150511153451

I would highly doubt it would be the whole map as if he ulted when a team fight happened across the map and could restart it? No. I would guess it would be a bit like Bards in a way where you lock in an area creating a bubble and you can reactivate it causing time to revert. Just my guess though.