i think it is supposed to be 3 lines per person, with any combo of tip ups and hand lines. But we've never followed that at my dad's place on the ice. Never seen a dnr guy come out, but i usually manage about 4 tip ups alone, (try for 5 and you just miss fish) plus my jigging rod. When more guys get out, the more traps we set. I have 7 of my own, plus 2 i am building just because i would like to catch a fish on something i made this year.
-mike