1 friedman unit = 15,778,800 s ÷ 691,200 s per nundine = 22.83 → 23

• the Roman 8-day market week

1 friedman unit = 15,778,800 s ÷ 88,775 s per Martian sol = 177.7 → 178

• a day on Mars

1 friedman unit = 15,778,800 s ÷ 15,552,000 s per school year = 1.015 → 1

• ~180 days

1 friedman unit = 15,778,800 s ÷ 1,209,600 s per fortnight = 13.04 → 13

• en.wikipedia.org

1 friedman unit = 15,778,800 s ÷ 24,192,000 s per human pregnancy = 0.6522 → 0.65

• ~280 days