[morzh]

I print my sch on 11x17". There is a compromise between putting enough on one sheet and the fact that the symbols will be scaled down due to a larger sheet size. Especially considering you have one library with the same size for a component type (if it is used for work and not for hobby, where it is easier to bend all kinds of rules; although Altium schematics look hideous in that respect as people take symboles from outside sources and I saw 5 different resistors symboles in one schematic by a colleague of mine), and it has to look legible on anything from A to D size.