Nope. It was not hard work. You enjoyed it. That isn't work.

I have never in my entire life worked hard at anything at college, university, etc. I just got As without doing any work.

I used to think that cleaning the house and washing the dishes was hard work. Now I don't anymore, because I enjoy that as well.

I write articles most days. A few days ago, I wrote three. No work was involved. Certainly time was involved, and I had to check things, but as I'm constantly in the zone, I don't consider it work.