I jump a bit more than most of you guys do - in the summer, out of the six rides a week, I jump 2-3. Usually one or two sessions are purely focussed on jumping, so either courses, or grids, to work on his agility and my ability to extend and collect his stride. On one day we might put up a single fence at the end of a tough dressage schooling session, because he loves to jump and it loosens him off after the hard work. We probably do one day of serious flatwork schooling a week in the summer, and the other three days are hacking out for fitness and relaxation.
In winter, because we live far north and it is always dark after work, we can't hack or jump in the fields, so we do five nights a week in the school where there is only room for single jumps (which don't do much for us training wise), so we do mainly flatwork, and a hack on the weekends, so plenty of jumping in the summer is a reward and a chance to get out of the menage over the good weather.
Maybe I jump him too much, but he loves it, I don't push him higher than he's able, and he's never had any soundness problems. He's fifteen now, so he's probably only got another summer or two of competing after this one, and his workload is on the downwards slope now, so I feel that I'm trying to manage it, and he would soon let me know if it was too much.