nope. no timers or anything. FD will be changing a bit with the next patch, but generally there is a small chance for FD to instantly cause the mob to forget you. if the mob returns to it spawn point and isn't a pather, then it instantly forgets you 100% of the time. pathers will either forget u when you flopped the first time or never forget you.
you can force mobs to forget you with sneak, but this is being patched soon*
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