I remember back in the day, some producers would make “megamix” vinyls that generally played as short as 6 minutes to as long as 20 minutes. They were specifically designed for DJs to use as a faster moving hitmix. Remix services still make these as well.
Here’s a few examples:
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I honestly don’t see an issue with DJs using those or similar things like. I don’t even see a problem if it’s one DJ all night and the place is empty (because it’s early) so he/she tosses on a mix CD he/she made.
I only have issue when a DJ plays another DJ’s mix CD, demo CD, etc. when he/she should be DJing or at least playing their own mix.