The timer was removed when the hr requirements to start were removed. ( maybe a lil before that actually) As far as it still effecting drops idk about that. I always have terrible drops lol. Rounds reset on mondays or you can end your expo and itll reset manually. I member the timer days man no screwing around or youd lose ALL progress and start from rnd 1 if it ran out.( just enough time to hit the bathroom and top off your drink) Now itll run all week. No lost progress or rnds/tiers dunno if this helps but hopefully it clears it up some.

Also any rnd completed counts as another rnd even if you do a lower tier.( hence why some people use alts to start then kick the alt. Aka tier locking)