Yes, it says that layout changes usually take about 10 minutes, but at least in my case, there are changes from yesterday that I have yet to see updated. For example, adding a new tab or adding a new text component on a page.
Database changes do update almost instantly.
When I use the browser, at least I have the refresh button (although the user should not have to know when to do it). But in the version that is on the iphone desktop, there are no bars at the top or bottom, there is no way to force the refresh.