We live in London, so have been to most of the free museums and galleries, but we've never been to the Royal Academy, so I was thinking of visiting with my 16yo son. We're not heavily into art, but just like to browse around a free gallery now and again for a day out. Looking at the website, it seems to have some free collections and a ticketed exhibition, but it said that the ticketed exhibition is in the "main" gallery. My question is, are the free collections substantial enough to warrant a 1+ hour visit on their own, or might we be in and out in 10 minutes?