Boss scaling
It is very short. A few seconds tops. It is easy to determine in Silverwastes during Breaches.
Restore that which was lost. And all shall be as one.”
Scaling is instant and everyone that can basically see the event on their tracker counts towards it, regardless of if they’re alive or not. Players standing around not doing anything will also count towards scaling – an easy place to test this is the event next to Ascalonian Catacombs.
What the wiki says is from pre-release and that’s how scaling worked prior to season 1. They were forced to change it when zerg content became popular and zergs could gank bosses as they spawned and before they scaled. Originally, you only counted towards scaling if you were dealing damage within the event’s area.
http://www.reddit.com/r/Guildwars2/comments/26vke4/boss_blitz_scaling_revelead/
Thank you. I was wandering about that.