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When did Greek writing become consistently left to right?

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Thematic map of Eurasia showing the approximate geographic distribution of Indo-European language families, each represented by a different color. Areas include Celtic in western Europe, Germanic in northern and central Europe, Romance in southwestern Europe, Slavic in eastern Europe and Russia, and Indo-Iranian languages in South Asia. Non-Indo-European language regions and areas of common bilingualism are also indicated. — Greek language Approximate locations of Indo-European languages in contemporary Eurasia.

Greek writing became consistently left to right after 500 BCE.1

Prior to this standardization, the direction of writing evolved through several stages:
* Right to Left: The oldest Greek inscriptions followed the direction of the North Semitic script from which the Greek alphabet was derived.1
* Boustrophedon: Around the 6th century BCE, this style became common, in which lines alternated direction—running right to left and then left to right—resembling the path of an ox drawing a plow.21

While some early inscriptions written from left to right existed before this period, it was not until after 500 BCE that the practice became invariable.1