If you need help with S&D challenges, you can always join my party. The one that takes the longest is the 50 detonations. I'm ~13 or so away from S&D Master and have ~800 matches played to give you an idea of how long it takes.
RIP Sacred_Asylum 4/1/13 Watching you play SnD is like watching Mozart paint a picture. It's absolutely beautiful. -supercoolisaac