Larger ones take much longer. Not highly iterative - Time required for each game takes too long. Replaying individual turns has value, and proceeds much more quickly. Numerous iterations are required of a game in order for its results to have statistical significance. Precursor of Computerized version .
Programmer needs a manual model to work from.
Varies considerably with skill of creators. Another hundred hours required for testing and finishing rules. Lack of sufficient skill will make successful design impossible no matter how much time is used. Forces - Same as model with map. Movement - Deduced as a result of force on force calculations.