I believe you are thinking of Venus.
However a day on Venus is 243.0185 days, not hours.
244 hours
24 hours
Mercury.
On Earth there are 24 hours in the day. There are 24hrs in a day. On different planets, it may vary.
Which planet?
Yes, all planets that we know of have at least some spin - their rotation on the axis being the planet's day. In our solar system Jupiter spins the fastest - with a day under 10 hours long.
Mercury, has 24 hours in a day, the same as the earth and all the other planets in the Universe.
The planets with the shortest days are Jupiter (9 hours and 55 minutes) and Saturn (10 hours and 30 minutes.)
Earth and Mars. Earth's day is 24 hours, while Mars' day is 24 hours 37 minutes.
murcury
23 Hours 57 Minutes and 14 Seconds
Just Mars.