I think the answer really depends on your outlook towards layouts. Are you interested in having a lot of buildings, structures, working accessories and industries that will take up a lot of space an require a lot of sidings, in which case (assuming an around-the-room layout with some type of liftout or gate), you might only have 2-3 mainlines. Or are you more interested in having a busy layout with a lot of trains running around and not so much interest in buildings, structures, working accessories and industries, in which case you might want to squeeze 4-5 mainlines in.
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