Week to Minute

The 7-day week was likely first used in ancient Mesopotamia, linked to the 7 classical celestial bodies visible to the naked eye: Sun, Moon, Mars, Mercury, Jupiter, Venus, and Saturn. These gave the days their names (still visible in English: Sun-day, Moon-day, Saturn-day; and in French: Lundi/Moon, Mardi/Mars, Mercredi/Mercury, Jeudi/Jupiter, Vendredi/Venus). The 7-day week spread through Jewish, Roman, and Islamic calendars and eventually became global.

Yes. Ancient Rome used an 8-day market cycle (nundinae). The French Revolutionary calendar used a 10-day decade. The Soviet Union tried 5-day and 6-day continuous work cycles in 1929–1940, eliminating the shared day off to maximize factory output. All alternatives eventually failed: the 7-day week is synchronised with religious practice (Sabbath, Friday prayers, Sunday worship) and is biologically suited to human work-rest rhythms.

ISO 8601 defines Monday as the first day of the week (Day 1) and Sunday as the last (Day 7). This is standard across the EU, UK, and most of the world. The US, Canada, Australia, and many Latin American countries traditionally treat Sunday as day 1 — as reflected in US calendars and spreadsheet software defaults. When writing code that spans regions, always check whether the week starts on Sunday (0) or Monday (1).

Gestational age in weeks is far more precise than months because months have variable lengths. A 36-week pregnancy and a 40-week pregnancy are in different developmental categories (preterm vs. full-term), but both might be described as '9 months.' Clinicians need week-level precision for lung maturity, organ development, and intervention decisions. Ultrasound measurements are calibrated to gestational weeks, not months. The 40-week count begins from the last menstrual period, not conception.

A common year has 52 weeks and 1 day; a leap year has 52 weeks and 2 days. Under ISO 8601, each year has either 52 or 53 numbered weeks (Week 1 is the week containing the year's first Thursday). Years with 53 weeks occur about every 5–6 years. In 2015 and 2020, ISO Week 53 existed. This affects fiscal calendars: companies on a "4-4-5" or "52-week fiscal year" must reconcile the 53rd week when it appears.

David Allen's "Getting Things Done" system popularised the rule: if a task takes less than two minutes, do it immediately rather than adding it to a list. The logic is that the overhead of recording, tracking, and returning to a trivial task exceeds the time to just finish it. Cognitive science supports this — task-switching costs 15–25 minutes of refocusing time, so deferring a 2-minute email reply actually costs 17–27 minutes total. The rule exploits the fact that most perceived obligations are actually quick — studies show about 40% of to-do list items take under 2 minutes when actually attempted.

"Minute" (the time unit) comes from Latin "pars minuta prima" (first small part). "Minute" (meaning tiny) also comes from Latin "minutus" (small) — they're the same word. So a minute of time literally means "a small part." The phrase "wait a minute" historically meant "wait a moment" — the actual minute-length duration came after the word entered common use. "Just a second" is similarly imprecise in informal speech.

Earth's circumference (360 degrees × 60 arc-minutes each = 21,600 arc-minutes) was used to define the nautical mile as 1/21,600 of the circumference — about 1,852 m. At any latitude, one minute of latitude always equals one nautical mile, making position plotting on a chart trivially simple: the chart's latitude scale is simultaneously a distance scale. This is why mariners and aviators use knots (nautical miles per hour) rather than km/h.

Calorie burn varies enormously by body weight, intensity, and activity. Approximate values for a 70 kg person: walking (4 km/h) ~4 kcal/min; cycling (moderate) ~8 kcal/min; running (10 km/h) ~11 kcal/min; rowing (vigorous) ~14 kcal/min; elite cycling sprint ~25 kcal/min. The "calories" on food labels are kilocalories (kcal). A 500 kcal meal requires about 45 minutes of running to expend — which is why diet is generally more effective than exercise for weight loss.

John Cage's "As Slow As Possible" (ASLSP) is currently being performed on an organ in Halberstadt, Germany, and is scheduled to last 639 years — ending in 2640. Each chord change is separated by months or years. The first note sounded in 2001; a chord change in 2022 drew crowds. More conventionally, Erik Satie's "Vexations" (1893) is 180 repetitions of an 80-second piece — about 24 hours played continuously.