Buffs here holds 30 minutes. Thats why Alkien asks for Dances/Songs 30 minutes as well. Since everyone made himself a Dancer and Singer, you would have both all the time anyway. Its just the fact that you have to change your client to the both buffers every 10 minutes which also causes critical errors often. So putting Dances and Songs to 30 minutes as long we dont have enough people, playing both classes actives.