How much time elapsed between the initial flawed test shot in May 1990 and the corrective servicing mission in December 1993?

Answer

Roughly three and a half years

The servicing mission, STS-61, took place in December 1993, roughly three and a half years after the initial May 1990 test shot.

How much time elapsed between the initial flawed test shot in May 1990 and the corrective servicing mission in December 1993?

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