Mohave County recently posted the results of its hand count tabulation experiment.
They counted 850 ballots with an average of 36 races per ballot. (30,600 contests).
They estimated that it would cost the county an additional $1.14 million to hand count races in 2024 as opposed to machine county.
But only if there are no recounts (there were recounts in 2022). If there are recounts, it will cost more.
They had an error rate of 5.4%. The maximum allowable machine error rate for certified equipment is 0.00001%.