There’s so much hidden in most pavilions that most people probably never see.
For example the temple in China is a replica of a genuine Sun temple, with intricate and ornate interiors. And there are gardens and shops hidden off down to the side. Most people will only look at the temple, maybe watch the acrobats and move on.
I think the only pavilion that doesn’t have any hidden features is America!
So it all depends on what interests you. Is WS just a shopping and dining destination, or do you want to look at the architecture? Every other pavilion aside from US and France really) is based on real places. Even Canada’s gardens, since you can’t go inside the building. I find it all fascinating. WS for me is a minimum of an hour in each.
So it’s such a personal thing that it’s impossible to answer. But if you do just want to stroll round the lake and look just from the path, then the 20 minutes in the TPs is do-able. .