Taking a full forty days, for that was the time required for embalming. And the Egyptians mourned for him seventy days. (NIV)
Then forty days were devoted [to this purpose] for him, for that is the customary number of days required for those who are embalmed. And the Egyptians wept and bemoaned him [as they would for royalty] for seventy days. (AMP)
And forty days were fulfilled for him; for so are fulfilled the days of those which are embalmed: and the Egyptians mourned for him threescore and ten days. (KJV)