Well i was GL/RL back in vanila/TBC in a top3 world guild... you basically needed to play whole day during progression, since you needed to farm pots/stuff half of day and other half you raided it was fun tho, specially wiping on over tuned and bugged encounters for weeks but after content was on farm you could loged for that 1 days for week, drunk, did speed run clear and logged off ... have no idea how is it now, i started to play casually again at the end of mop and now in only clearing heroic with pug... but im a bit tempted to try it out, just dont know if i have time, since i know that when content is released you pretty much need to be there....