LEGAL NOTE: It is not Anticipated or Expected that the lego company endorses this video; and is for adult users only. Like any plastics, Lego is not invincible from UV damage for being outdoors. On sunny days, you can see the age, on cloudy days they look more traditional.
In 2001 I visited Legoland California, and in 2019 I went there for the first time in 18 years. The Outdoor Miniland USA got baked in the sun and had received sun damage. Legoland Florida has only been opened for over a decade and there would be high suspicion that UV or heat damage could apply to Miniland objects. Legoland New York had opened in the midst of the pandemic in the Hudson Valley of NY, and it would be interesting to see how that Miniland fares overtime if the Legoland park managers had put trees and plants to protect bricks from extreme weather in the Northeast. This is the only way to protect your investment.