The first 20 seasons of Family Guy would be roughly 70 GB at 1080p , based on forum estimates for the full set of seasons 1–20. A lower-quality copy can be much smaller, with one user reporting about 12 GB for the same seasons and about 6 GB after extra compression at around 480p.

What that means

  • 1080p version: about 70 GB.
  • Compressed / lower-quality version: about 6–12 GB.
  • Rule of thumb: the file size depends mostly on video quality, compression, and whether the episodes include extras or subtitles.

Quick note

Family Guy episodes are typically around 20–27 minutes long, so 20 seasons adds up to a lot of runtime, which is why the total size can climb quickly.