I am a huge fan of rock and metal, in particular all things experimental/progressive. It is fairly common for prog albums to feature extended track lengths, and or the last year or so, the longest songs on my playlist have all been from TOOL. On their newest album (Fear Inoculum) the shortest non-filler track clocks in at 10:20, and the longest at 15:43. When I first discovered TOOL, I thought their song lengths were ridiculous. Now I'm finding rock/metal songs that are over an hour long (Fantômas' Delirium Cordia is 74:17!). Don't even get me started on the craziness that is Sleep.
My question is, for artists hoping to make a living off their music, is there a sizable audience for songs of these lengths? In 2020, do metalheads really have sufficient attention spans to not be bored out of their minds? Or is it more sensible to split up long songs into multiple tracks, e.g. TOOL's Wings for Marie (Pt. 1) and 10,000 Days (Wings Pt. 2)?
Thanks in advance!