My oldest used a walker ( yup all the time) After DS2 was born they came out. I used them ALL THE TIME with all 3 boys We had a jumperoo too all 4 boys loved those. No hip deformities or issues walking at my house. They were ususally in the center of the living room or kitchen.
YES there were times each of them were in it more than 15 minutes. I even too it outside to do yard work