Long prog songs

I am kind of new to prog music and I just heard "Other Half of the Sky" by Moon Safari for the first time. It's a little under 32 minutes and it's the longest prog song I have heard. But if you count albums with one song split into two parts(ex. Thick as a Brick), then the longest song I have heard would be Tubular Bells by Mike Oldfield which is 49 minutes(I think). The longest non prog song I have heard is Blue Room by The Orb. It's an ambient dub song that's around 39 minutes long.