on one's own time

on one's own time idiom
During non-working hours, especially when one is not being paid. For example, Marcia wrote poetry evenings and weekends, on her own time. This expression implies that the time one spends working for someone else is no longer one's possession.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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