If Earth rotated faster, the length of a day would become shorter than 24 hours, so there would be more days in a year while the year itself (the orbit around the Sun) would stay roughly the same length in time.

What sets the length of a day?

  • A “day” is defined by how long Earth takes to complete one full spin on its axis, currently about 24 hours (86,400 seconds).
  • If the spin speeds up, each rotation finishes in less time, so the day’s length shrinks accordingly.

If Earth rotated faster

  • A small increase in rotation speed would shorten days by milliseconds, which is already observed in modern precision timekeeping.
  • A large increase (say, shaving off minutes or hours) would make each day noticeably shorter, giving many more calendar days in the same physical year, since Earth’s orbit period would barely change.

Knock-on effects of shorter days

  • Timekeeping systems (like leap seconds or even the idea of a 24-hour clock) would need adjustment to keep civil time aligned with Earth’s new, shorter spin period.
  • Faster rotation would strengthen the equatorial “outward” effect from rotation, slightly reducing apparent gravity at the equator and changing how air and water circulate, which could alter weather patterns.

Extreme “what if” cases

  • In very extreme thought experiments, where a day shrank to an hour or less, the equator could approach a condition where objects feel almost weightless, and the planet’s shape and climate would be drastically different.
  • Those extreme scenarios are not realistic for natural near‑term change but are useful for understanding that as rotation speed rises, day length keeps dropping in direct response. Information gathered from public forums or data available on the internet and portrayed here.

TL;DR: If the Earth rotated faster, each full spin would take less time, so days would be shorter than 24 hours and there would be more of them in a year, with additional impacts on gravity, weather, and how clocks are kept.