It's a bit different though. I think the are reasons for 12 months, 7 days per week, 3 months quarters etc. My version keeps it all and avoids points in "disadvantages" section of the Wikipedia article.
7 days per week seems to be so ubiquitous now because religions that depended on that particular cycle (Judaism originally, and from thence Christianity and Islam) are so popular. But, historically, societies have successfully existed with weeks ranging anywhere from 5 to 10 days. Romans, in particular, had an 8-day week for most of their history.
(7 days per week has a more natural meaning if your calendar is lunar overall, so that weeks can be aligned with months. But lunar calendars are overall very messy due to disagreements with the solar cycle, so it's best to not go there in the first place.)
