If we can reliably get to Sindragosa or kill her in one night I have no problem with doing that Tuesday and working on Arthas on Thursday. What I would hate to have happen is 6 hours a week of dying to the same boss fostering more anger, frustruation, and hate then the good it may cause in practice. Morale is already in the crapper, and I cant see having two nights of wipe on Arthas helping an already bad attendance issue. Two wipe nights may be the death blow for some people that arent as motivated to get a LK kill. If you want to only do a full clear every two weeks and see how it goes maybe that is a reasonable compromise. Three hours on a thursday is alot of time to practice one boss. Even then after and hour or two I see concentration fade away. I would love to see a LK kill on 25 before summer starts to get into full swing, but I fear that some people will not tolerate two wipe nights for long before they phase themselves out for the summer to do other things and prepare for Cataclysm.