Actually, arguments in favour of "economy of form" which demand that media such as albums, films, books not "waste the audience's time" buys into the commodification of every aspect of existence by capitalism. Art should not subscribe to this commodification: it should resist it. So fill your novels with as many digressions, your movies with as many lingering shots and unnecessary scenes, your albums with as much filler as you feel like doing. I will be happy to waste that time with you.