The biggest recorded blue whale was a female in the Antarctic Ocean that was 30.5 m long (more than 3.5 times the length of a double-decker bus and as long as a Boeing 737 plane) with an estimated weight of 144 tonnes (almost the same as 2,000 men).
Whether you use a boxed hair color at home or you get it done professionally at a salon, the recommended wait time before washing your hair is 24 hours.
Quick Answer. Freshly dyed hair can be washed after 24 hours. It takes this long for the new color to be fully absorbed into the hair shafts.