door bouncers

what age did u put ur lo in them? millie is nearly 12 weeks but she is still a bit small for hers so i only have her in it for 5 mins a day although she loves it!! when she is bigger how long can u have them in it for at a time?? i know with them play station things where they sit in and walk round the middle they say 20-30mins at a time but there is no time linit put on the bouncers although they r still putting some weight on their feet so will it be the same?? xx