I disagree with that but its okay for diversity of what constitutes a good rate of return on investment.
Five years would be better by a long shot and that is the longest I would ever even consider a long shot as an equipment investment over the years.
Normal is TWO years for MOST top tier manufacturing companies.
I am a little less stringent and looked for three to four but depending upon cost and longevity I would on a far outside whim consider a five year return.
Ten??? Totally out of the realm of consideration FOR ME. Maybe not for you. And that does not make YOU wrong. Just the difference between two people...