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Re:NASA says Webb’s excess fuel likely to extend its lifetim... by K5EiS on Tuesday January 11, 2022 @01:21PM (#29895435)
I couldn't find any legal requirements, but the ESA recommends a reentry withtin 25 years of mission completion to reduce waste in orbit.

https://www.esa.int/Safety_Security/Space_Debris/Mitigating_...

Re:NASA says Webb’s excess fuel likely to extend its lifetim... by dotancohen on Tuesday January 11, 2022 @02:12PM (#29896248)
I am aware of this, but it is not legally mandated as GP states.