The Tellus Calendar is a "metric and perennial proposal for calendar reform" by Gabriel Rindborg from 2021 based upon the 18th-century French Republican calendar (FRC).
Like the FRC, the Tellus Calendar has 12 months of 30 days each, which can further be divided into three weeks of ten days each. It does, however, not change the month names nor the start of the year. The remaining five or six days are collected in a Celebration Week at the end of the year.
The author proposes a three-day weekend for the calendar's ten-day weeks, so there would be slightly more days off than with a two-day weekend in seven-day weeks: 3/10 = 30% > 2/7 ≈ 28.57%.