I'm sorry, I am not aware of any cube-shaped ancient Egyptian buildings. The ancient Egyptian royal cubit is a measurement of length, which measured approximately 523.5 to 529.2 mm in length, according to a measurement of 14 such rods by Lepsius in 1865. Since light takes 0.00333564095198152 nanoseconds to travel one millimeter, it would take between $523.5 \times 0.00333564095198152 = 1.74620803836232572$ and $529.2 \times 0.00333564095198152 = 1.765221191788620384$ nanoseconds to travel one royal ancient Egyptian cubit.
spam fails_task lang_mismatch pii not_appropriate hate_speech sexual_content quality toxicity humor helpfulness creativity violence