I wanted to mention that we appreciate the suggestion, and we have added an optional bit of information to the Demo and CG templates.
Here is what was added:
*It might be helpful if you could roughly indicate the game's playtime.
*This is OPTIONAL; simply say how much gameplay time your game offers (in hours/minutes). Feel free to use the below guide as a reference:
Microgame (< 1 hour)
Short (1-3 hours)
Moderate (3-5 hours)
Long (5-10 hours)
Very long (10+ hours)
We left it as "optional" because we (RRR staff) do not feel that it is so important that a game topic wouldn't pass the Submission Forum without it.
Again, thanks for the idea. =]