44It is important at the outset to bear in mind that Directive 2008/115 concerns only the return of illegally staying third-country nationals and is thus not designed to harmonise in their entirety Member State rules on the stay of foreign nationals (judgment of 1 October 2015, Celaj, C‑290/14, EU:C:2015:640, paragraph 20). Accordingly, the common standards and procedures established by Directive 2008/115 concern only the adoption of return decisions and the implementation of those decisions (judgment of 6 December 2011, Achughbabian, C‑329/11, EU:C:2011:807, paragraph 29).
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