Samsung's new flagship trio is capable of recording 8K video at 24fps, an industry first. Naturally, this comes with increased storage requirements, but it's not as bad as you may have thought. According to Samsung's official numbers, 1 minute of 8K video results in a 600MB file (using the HEVC codec). That's less than double the 350MB file you get when you record 1 minute of 4K video with a Galaxy S10+. The Samsung Galaxy S20, S20+ and S20 Ultra will be capped to 5 minutes when shooting 8K (regardless of whether you have the Exynos or Snapdragon version). Of course, the S10 generation...
Source: https://www.gsmarena.com/recording_8k_video_with_a_galaxy_s20_will_take_a_toll_on_storage_but_not_as_much_as_you_think-news-41506.php