17 Seconds
Banned
Melee in this game happens rarely enough that i think it should be a one hit kill. Most weapons have a <1 second time to kill, if they can come at you from the front and get into melee range before you shoot them, they should be able to kill you in one hit. If you're getting constantly killed by melee, maybe carry a shotgun to counter it or avoid the smaller rooms where melee kills are more common.
The current melee tracking/hit detection really does leave something to be desired though, it's really inconsistent and every time I think I have it figured out something really weird happens.
what game are you playing?