think it took me 3 hours to get from 55 to 60 with cyclops doing nothing but MM last night in a 3-4 person group rerolling lq's as often as i could. what really sucked all the chests i was getting were L57-59 so had to wait to open them. lots of bad rolls on the bosses, lots of doops, kurse/mel and the other 2 boss events.
as far as the chest go at 60, was checking the numbers with my artifact, with +191% got an average of 741,000 per chest, which means it would take 31 per omega point.
with 120% rif, got an unique every 4.6 chests
with 60% got 1 every 7.7 chest
certainly need more data, that is just from around 100 so far