Well it might not necessarily be as serious, but I enjoyed being able to raid 25s maybe 3 or 4 weeknights and start a 10 after that if it wasn't too late or do 10s on the weekend. Raiding is my favorite part of the game, so if I'm really into it, I'm into it.
I do wish there were more somewhat serious (at least focused) progression guilds that did weekend raiding. Hell, even if a guild had Tuesday or Wednesday, with the other day or two being Friday, Saturday, or Sunday, I'd be into that. There are some out there, but unfortunately that requires character transfer which for me is probably at least $50 for my main and a second 85 for profession support/play variety.
I've realized that for the most part, after doing it for some of 2 years, I just can't commit to a raiding schedule that has more than one weeknight of more than 3 hours while being in College without having my grades or other aspects of my life suffer some. 3 hours or less a night for 3-4 nights? Maybe. If one or two nights of a 3-4 day raid schedule were Friday or Saturday? Definitely.
I'll see what I can make happen when 4.3 rolls around since I would like to complete that (as well as be overpowered to wrap up T11 and T12 raids/achievements.) If I find a part-time this semester I might be able to justify the transfers I would like to enjoy the game more again. For now, it's either no play or limited play for me.
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But no, I never did double-progression raiding like you mention Alex. Even though I might like to do that, I simply couldn't afford the time-sink.