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Yes, there indeed may be more holes on the north side of a saguaro cactus (Carnegiea gigantea or Cereus giganteus). Specifically, the south side of a cactus gets the most sun. Water loss therefore is...
A saguaro cactus [Carnegiea gigantea] may reach a mature weight of 10-15 tons. Anywhere from 75-90% of its total weight is due to water processing and retention. Its mature height is 40 feet/12...
It just depends on the genus/species, but if you bought a cactus from a home improvement store and it was small it will grow to be large depending on the genus/species. Most of the cacti sold at home...