I was in a terror rift and since I‘m in a full party, I‘ll benefit from the double gem drop. It worked perfectly fine, but after the terror rift ended, I‘m not receiving any more duplicate drops. Doesn’t matter if items or gems or gold. So it lasted less than 12 minutes for me.
Unlike the previous iteration of this event where the 24 hours of buff only counted down whilst your hero was logged into the game, this version of the buff lasts for 24 hours of real time, i.e. it ticks down to zero regardless of whether your hero is logged in or not, from the moment you activate the buff.
So, when did you activate the buff?