Name me 3 games that take 15 minutes to load.
Ocean games took about 4 - 5 mins
30 seconds to start the intro music 3 - 4 min tune 30 seconds to load the final bits
There were/are hunderds of C64 games that took nearly 15 minutes to load before the "Turbo loaders" were written...
I wrote my own Turbo loader (Screen Turbo it was called) way back in the 80s which takes a maximum of 34 seconds to load any game from tape on the real C64 (full memory load including under the roms)...