Let's do an album...

Interesting: Physical media used for music have constraints built in, which shapes the nature of the work. The vinyl LP (45-60 minutes), the CD (60-75 minutes), the 45 (8 minutes, with B-side). In the age of the LP, an artistic decision might be “we need 5 more minutes”, or "lets' do an album" (which would mean you had to do it in 60-120 minutes) But when the medium is a digital sound file, there are virtually no duration constraints. How does this affect the content or ideas about content?