A measure of something's quality based on how well it continues to be successful as times change. This could apply to works of art, literature, scientific theories, business strategies, inventions and more. Something that stands the test of time becomes iconic or classic within their fields and remains widely appreciated, influential, and relevant after decades or even centuries. The notion reflects an idea of enduring impact over a significant timespan and signifies greatness, cultural resonance, and enduring value over passing trends.