*snip*
it would depend on the paper/card thickness, the pressure exerted to make the cut, etc...
and if the blade is a good fine steel, with a degree of flexibility, more cuts before change.

...
i use an SA-80, and a 50/100-tEV capacity particle accelerator, and that's just for the bogroll.

nahh!
but seriously, just a set square, and a carpet/box knife.
have two versions:
1, the double-sided blade in a die-cast iron grip (replaceable) made by stanley tools.
2, a disposable knife, where the blade is a stacked thing (ten blade segments) can be broken off a blade segment at a time, similar cuts to the stanley made knife, but i do prefer a nice pair of baps...the latter.
