Six groups, in the order they come up. The role questions belong before the first play. The engine group belongs before every outside-hand play, not once per game. The sideboard group belongs after you have built the post-board deck and before you shuffle it.
Pilot noteIf only one group survives time pressure, make it the engine group, and specifically the first question in it: is the Legend ready. Everything the deck generates is worth nothing on a turn where it cannot be converted.