Depends on the size of the playstand, and how much interesting stuff it has on it to make the bird want to stay put, and how well the bird is trained...
Mine are out 24/7, and only seem to go inside their cages to eat. Maggie doesn't even do that. She just opens the treat cup doors from the outside, and sits on the treat cup doors to eat...
My biggest playstand, however, is 7 feet tall, three feet wide, three levels, with toys all over the place, two hanging playgyms, two flyers, and two cargo nets... I've had as many as 14 birds on that thing at the same time with room for all of them to move around and play.
There are three other playstands in my birdroom in addition to that one.
So, yeah, they rarely venture out of the birdroom on their own, except to come and sit with me.
They don't chew up the inappropriate stuff, because they have so much appropriate stuff to chew up.