First of all, there is no fixed rule about how much a calligraphy painting costs, but it should be analyzed in detail according to the composition mode and the size of the work, from the perspective of beauty and propriety.
As long as a work is aesthetic, even if it is printed on one side, it is not less. For composition, double-sided printing is also appropriate, not too much on three sides. . As we know, in classical Chinese, "three" is often a divisor and a synonym for three or more numbers. Then, we can interpret this passage as follows: how many squares are printed depends on the needs of composition and aesthetics.
Obviously, if you need to use multi-party printing, in general, it is best to use odd-numbered printing. This statement can also be found in the theoretical records of seal cutting, Chen Mugeng's "Seal Cutting Needle on Poetry Printing in Qing Dynasty".