Always found "extended" to be a funny phrase in music context. When a track is being produced, these are the versions that are typically made first. Then they cut some parts for the shorter version, often callad the Radio Edit(ion).
So rather than the long version being called extended, if anything the short version should be called shortened. After all, it's not like they make a short track first and then add a bunch of stuff to it because lol&lmao.
Now that that pet peeve is out of the way I went straight for the extended ones, the way these tracks were meant to be. Very high energy! The pumping beats make me want to go drive 220 km/h on the German Autobahn. A great find, Retro! I'll look more into Casepeat. Interesting to see this kind of music coming from South Korea.
Does it take a lot more effort to make a 7 or 8 minute track than a 3 to 4 minute one? I'm thinking that given the repetition in most songs, it wouldn't take that much more effort, just add a few extra sequences in and your done.
It's a bit more complicated than just copypasting a few extra sequences and then calling it a day. All the sounds, they have to work, if that makes sense. Maybe for some tracks it all sounds similar, but take Jack to the Sound of the Underground for instance. Lots of unique bits and pieces in the longer version that you just don't hear in the shorter version.