Mine vary on the rule set. As per the post on Cerignola I just posted, mine start at 36 and go up to 72 when using Pike and Shotte. For other rules they go up to 216.
For TtS I'd probaly go for 54 - 9 wide, 6 deep, nine stands 3x3, six to a stand, stands 45mm x 45mm. That has a certain density and shape to it.