How big is a speed ball field?

Answer 1

The largest Baseball stadium in terms of distance from home plate to center field is Minute Maid Park, home of the Houston Astros.

The largest baseball stadium in terms of capacity is the Oakland-Alameda County Coliseum, home of the Oakland Athletics.

Answer 2

If you are asking about the game which is a combination of American Football, soccer, Basketball and Rugby, then the size of the field depends--as it can be played indoors or outdoors.

If played outdoors, Speedball is generally played on a soccer or football field. If played indoors, it is played on a basketball court.

I found another definition for speedball--and that is a variation of Paintball play. With this game, the field size isn't standardized, so it would depend on where you are playing.