I'm not sure how the timing exactly works but the time submitted is from the second I was capable to move my character & the second I downed all of them/they dc'd. The video continues on to show me hook all of them if it depends on the hooks as well which only adds 30 ish seconds to my time I believe. Which if I'm correct both of those times will be the new winrecord. The video starts from beginning game lobby to the very end when we can see all the stats

mod note: retimed. Timer ends when the hook bar next to the last survivor alive disappears, not when all survivors are downed.