Is there a time limit in Super Mario Maker?

I was playing this game on Wii-U yesterday at a retail store, but each time I was only allotted 10 minutes. Is this a feature of the game itself or is this a feature of the demo game?

What I mean by 10 minutes, is I started the game and in the top left corner it said 10 minutes, then began counting down. Once the 10 minute timer expired the game automatically restarted. I assume it is a feature of the demo only mode, not an actual restriction on designer mode.

I have never heard of a game putting a time limit, but wanted to check before I purchased the game and was disappointed.

This is not a feature of the game itself. I have played in sessions that exceeded 10 minutes by significant values of time. If I had to speculate, this was probably a demo restriction.