Measure a track or circuit in the paddock with CrossCountry App and cones. Ideally the length will be your speed in meters per minute e.g. 450 meters.
While you can do this by yourself with a watch it's easier to get a friend to time you as you ride around. Then you can just concentrate on your pace. Note the difference between your first minute with a standing start and second minute when you are in a rhythm.
Add a jump. What is the impact on your time and the pace you have to ride to still achieve 450mpm?
Add a combination with a turn. How much faster again do you have to gallop between fences? What is the impact of terrain e.g. you may have a hill going one way. Do you slow down more going up or down it?