For a horse in competition and full training, I condition in the morning 5 days a week. Then I have a second ride on those days. I only jump once a week (for most horses) and these will be lower jumps 3' to 3'3 set up as technical questions or lower XC jumps. Once a month This over fences work will be more serious heights and time. The horse hacks out the sixth day and has the seventh off.
Flat work is done the other four days a week. Good conditioning is a MUST and the flat work is what makes the jumping better, so cannot be ignored.
Many of my students only want to jump jump jump. If they don't have the discipline to do what is really needed, they have to find another coach.