638.35 centimeters is equal to 251.38 inches.
This length is approximately the height of two average-sized adult men (each measuring around 125 inches tall).
It is also about the size of a standard doorway (most doorways measure around 84 inches tall).
Additionally, it is comparable to the length of a full-size drum set (the bass drum usually measures around 22 inches in diameter and the height of the entire set can range from 60-70 inches).