the odd number is just there because most people have a patterned life. Invariably they cannot turn them every eight hours do the odd number simply ensures that the eggs are not on the same side for the extended period. eg - if you are a work 10 hours then your eggs will be on that side every second day if you turn an odd amount of times.I had one but it died.... I knew I needed to turn them an odd number of times but that third time almost NEVER happened for some reason so 1 time a day it is. My son was going to try to fix that issue with an cordless drill that didn't have a battery anymore. He has if fixed up to work just not wired up or on a timer. He wants to use an electronic control board of some sort. I am in no hurry to rush him. One time a day is working just fine. If my hatches go up I don't know were I will put them LOL.
most auto turners move the eggs every 2 - 6 hours.
many many scientific studies show that the more turning the better - especially during the first 10 days. The biggest sign of poor turning quality is dead in shell chicks and wrong end pips.