Of course, these oil changes & valve adjustments are relative to the life expectancy of the engine. I think (hope) Jims 600 hr est is conservative, my oil ch schedule exceeds OEM specs, I am ballparking the depreciation factor to 900 hrs @ 150 hrs per year = 6 years.
The 4th-century Tomb of the Lionesses consists of a small chamber with gabled roof. The painting depicts flying birds and dolphins and scenes from the life of the Etruscan aristocracy. The 6th-century Tomb of the Hunting Pavilion shows the view seen through the transparent fabric of the pavilion.
The Great Sphinx of Giza is an example of Horus in the Horizon. This symbol represents the Underworld or Land of the Dead. Originally it meant the horizon of the sun set. Later, it became the symbol of the west bank of the Nile, where the sun set and also where the Egyptians traditionally buried their dead. Symbol of eternal life.