Not sure where to post about. I started to make loops of tracks/songs during this spring. They usually based on original soundtracks instead of gamerips.
As for duration it can be increased in 2-4 times with several exceptions. I'm follower of various series so there presented favorite soundtracks.
I have more of loops stored on HDE so may upload MP3s here.

Anime & Videogame Loops Channel: https://www.youtube.com/channel/UCvMzQnVjpHMlTwzkRqJxjLA/playlists

Also below you may check playlists of extended tracks. Not everything but most completed ones.

Bloostained: Ritual of the Night: https://www.youtube.com/playlist?list=PLzLz84BOg2S6RtPt_lFHsJw90Ityd5DCw

Castlevania Adventure Rebirth: https://www.youtube.com/playlist?list=PLzLz84BOg2S5bjg2n35QnbvfP455oq1xd

Castlevania: Dawn of Sorrow: https://www.youtube.com/playlist?list=PLzLz84BOg2S7ZRET40Svp9enPCZI2-YcD

Steins;Gate: https://www.youtube.com/playlist?list=PLzLz84BOg2S7PDAaVMyu5o_lMmeOpDtsG

Rockman Zero 3: https://www.youtube.com/playlist?list=PLzLz84BOg2S5ZBF7okXk-N-_-dtxJaspO

Soul Calibur 3: https://www.youtube.com/playlist?list=PLzLz84BOg2S7g8r3DOvCXsqyecKGFMXYy

Added 2 extended tracks from Soul Calibur II Soundtrack.

Raise Thy Sword: https://www.youtube.com/watch?v=jVN6u1g3qQI
Sword of the Patriot: https://www.youtube.com/watch?v=QpumHbVpsao