Hi all,
All 3 of my kids loved the jolly jumper, and would stay in it all day if I let them. My first born in particular. He would spend up to 1 hour in it at a time, and up to 4-5 times per day. (He wanted more, but we had to put a limit on it). He was walking on his own at 12.5 months. He has had no problems with hips, legs, joints etc. I found it helped him, because he would stand on his feet, and hold all his own weight. He even started to try to walk in it, and when we took him out, he stood up on his own. (This was at 10.5 months). We packed it away when he was 11 months, to encourage him to walk on his own. My daughter, loved it, but not as much as my first son, and my baby boy only enjoys it now for about 15 minutes at a time, a few times a week. He is now 9 months old, and walks around the furniture. The jumper restricts him to one place, and he doesn't like that. Hope my story helps in making your decision.
Tracey
Mother of 3, Qld