What takes twice as long as diaphysis?

The term "epiphysis" refers to the end part of a long bone, which can take twice as long to develop compared to the diaphysis, the shaft or central part of the bone. This difference in growth duration is due to the epiphyseal plates, where bone growth occurs, remaining active for a longer period during skeletal development. Consequently, the epiphysis often continues to grow and mature after the diaphysis has completed its primary growth phase.