What constitutes "quick succession"?

[yoyoma]

To get a double, triple, etc. kill each kill must be made in "quick succession". What is the max allowed time frame between kills to qualify for a kill streak?

[Silencer]

4 seconds.

[yoyoma]

Thanks. Dang 4 seconds is not that long a time. I was curious because I was on Hossin and got the drop on several (I assume) new players and it seemed as if the only time spent between kills was me reloading. I didn't get the streak notification except for when I wasted more than one enemy on one clip. Now I know why!