I've had 6 in about 3 seconds with golden gun lol, and I've had several split sevens (triple followed by a breaker, or slayer followed by a double) with various other things. This is one of my very old clips and the second half of it really shows just how odd and short the timer can be. Sometimes it chains multis despite the score not chaining, other times it doesn't chain the multi despite the score chaining. I really hope they bring the multi kill timer up to either 3.5 or 4 seconds for destiny 2 so that there can be more non super high multis.