IIRC, there's a legal/contractual definition of an LP (versus an EP) and a minimum number of tracks need to feature for it to be properly treated as an album. The prog rock band The Mars Volta had a song on one of their albums which was 30 minutes in total, but the album would only consist of 3 or 4 distinct songs despite the total length being nearly 70 minutes. In the end they had to split the 30 minute track into half a dozen "movements" with separate names, which all flowed together when played (eg. no silence before/after each movement), specifically to get around this issue.