Calendar or duration rule
hours = minutes ÷ 60.
The decimal result and hours/minutes form answer different scheduling needs.
Worked check
For 90 minutes, divide by 60 to get 1.5 hours. In clock-style language that is 1 hour 30 minutes, not “1:50”. Use the decimal form for arithmetic and the hours/minutes form when communicating a duration.
Rule: hours = minutes ÷ 60. The decimal result and hours/minutes form answer different scheduling needs. For a final check, distinguish calendar arithmetic from elapsed duration, confirm the intended local date or time zone, and inspect month-end, leap-year or daylight-saving boundaries when they can affect the meaning.