Im typicall the one getting rolled.
Also for clarifications, 3-6 is more for a “round”
So in payload maps where there is only 1 round its the 3-6 mins, but the capture the points where you need 2 to win, that takes multiple rounds. so 6-12 mins for those modes.
Also this is just my personal experience, playing around plat.
15 min games are not that common for me. Ill post the codes when I get home, but unsure if they are still valid. I saw a post by blizzard a few days ago saying they will be wiped.