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If you think old, unoptimized, high-human labor business processes exist only in Japan, have I got a bridge to sell to you.

Optimizing 100 hours per year to 20 hours isn't much either..

It's 3 days, for that to break even development costs have to very low.

Of course, selling it as a generic app for counting things is a great way to do this.

That part of the article confused me too, I think it's later implied they pay that 100 vs 20 hour cost much more often than once a year.

It does mentions three months reduction of labour cost, which is a lot more than 80 hours.