How about people that don't have Mic's? It would help me more to see what they are going to build next ratter then me make things they don't need?
Well There is a text messaging service on xboxlive not just voice so maybe getting to know your friend and planning whats gotta be done next.
the game does not have a time limit (atleast i think)
Hopefully getting to know what your friend is building in a future version of the game