How long can your nails grow in one night?

On average, fingernails grow about 0.1 millimeters per day, which translates to roughly 0.004 millimeters per hour. This means that in one night, nails might grow only a tiny fraction—approximately 0.02 millimeters. However, growth can vary based on factors like age, health, and genetics, so some individuals may experience slightly faster or slower growth.