There are established deadlines for submitting orders. When someone misses it, one of the following things happens (which one happens is agreed upon before the game starts):
- units for which orders haven't been submitted just hold still, or
- whenever anyone's orders are missing after the deadline, the game gets paused and there is an open call for replacement players in a mailing list.
If you are playing over email and one person becomes unresponsive, what is the standard thing to do?