How long does a unit typically take to make from concept to playable unit?
With a finished concept piece, it could take from a few days to a few months, to create it for the game. Much of this time depends on the priority of the unit amongst other development goals, as well as the iterations necessary to perfect the unit. The Zerg Baneling is an example of a unit that took only a few days to complete after the concept, whereas the Protoss Stalker has gone through several iterations, and has taken 4-5 months.