NFPA 70E has all kinds of documentation requirements but no mention of the retention period for the documentation.

This week begins a series of question regarding the various documentation and retention period of that documentation.

First up:
Energized Electrical Work Permits.
Please keep the response to just the EEWP and not other documentation which will be addressed in subsequent questions.

How long do you/employer retain Energized Electrical Work Permits?

Until the job is completed
1 Year
1 to 3 years
3 to 5 years
5 to 10 years
Indefinitely