Wondering the optimum size for open world map

You can write your topic however you want, but you need to answer these questions:

  1. What do you want to achieve? Thinking about making animal survival game problem is I don’t know how sizes are compared in maps in roblox so they would be optimized enough for lets say 50 players a server?

  2. What is the issue? Not an issue, but willing to know.

  3. What solutions have you thought of so far? Nothing, never made open world map in Roblox.