[jopsen]

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.

[YokoZar]

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.

[frosted-flakes]

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