What is a surface?

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Ok, so working on the assumption that it better to have as many textures as possible on one Image. (Please if this is not so then tell me, but the above replies imply so).
Then what is the biggest/largest size that an image-texture map can be.
(If that a how big is a ball of string question, then what the biggest I should really make it)

Im assumeing that each card will be different, but that they will be generaly standard. SO 512.512 upwards to mayby 2048.2048 or could I go for 4096.4096 safly?
(As you can see I have no idea. - But I assume maxscreenWidth^2 would be safe)