You tried retirement, decided you wanted to return to the busy work world, and you did just that. Kudos!
Sometimes "work" is simply something to do. Meet new friends, chit chat with co-workers, keep busy and make a few dollars for fun spending!
Wish you had written more about your story --
but I think you did what your heart told you to do.
You can leave whenever you choose to, or stay for years. You are no longer dependant on the employer. It's all about Choice -- and you've got many of them!