Heck, a first run through the Manufactury might even best 1k/minute.
EDIT: As an example, I play quests like F2P players play challenges: most value from the fewest runs. If I run a quest once for 20k in 30 minutes I consider that a "win" compared to running it twice for 30k in 20 minutes total. It's simply how I enjoy the game.
My one experience with a legend life was quite fun because I added "every explorer, every rare, then top off slayers' for every wilderness area in the game. That was quite poor xp/minute even by my standards, but it was super fun. Especially because it was essentially a ton of new content I'd never seen before. Who knew that Searing Heights was interesting? heh.
On that life all told I got a hair shy of 700k xp from s/e/r during heroic levels. That took the edge off third life xp requirements, for sure.