I can't remember everything I've read everywhere. I know one place I ordered
juice from in the States indicated 6-8 months. Said they didn't use preservatives. So I looked at one of the places with a 2 year shelf life and preservatives weren't listed as an ingredient. Unfortunately, when listing ingredients many places only think it important to list PG/VG and maybe the major flavor(s). Food type labeling doesn't apply.
One bottle of
juice I ordered and received in August 2010 lists no ingredients at all and states 'expires 24 months from date of purchase' and then also states PRD: 26/08/2009 and EXP: 25/08/2011. It won't last me that long but it does say something about how long juice might sit around before even being sold.