Scientists predict Earth's day will gradually lengthen to approximately 25 hours over the next 200 million years. This change is attributed to the Moon's gravitational pull causing tidal bulges, which act as a brake on Earth's rotation. Experts emphasize that this is an extremely slow process, measured in fractions of a second per century, and will not impact human lifespans or daily life in the foreseeable future. The Earth's rotation rate has historically varied, and this gradual lengthening is a continuation of that trend.