The speed challenges would not be topic based like the Monthly ones. That would allow for too much interpretation, instead I propose that the speed challenges are based on day to day objects, making the challenge more hard surface modelling based.

Now I am not going to take credit for this idea, I am kind of copying the idea from another site I used to use when I first started out with SoftImage.

To help you out with this I will post some of my past speed challenge stuff. All the images were done within 1 hour, they are not great as I had literally just started, so be gentle

Have a gander at these https://simplymaya.com/forum/showthread.php?t=17281