How to set a reasonable ratio between speed and acceleration?

Hello:

    I read in the "Installation Guide"  that: Acceleration values are advised to be below 800 °/s² or below 2500 mm/s². It is good practice to choose a reasonable ratio between speed and acceleration depending on the distance of the waypoints."

    Is there a way or formula issued by UR to get the Ratio between speed and acceleration?

Many Regards.