As most are aware, Twitch as started to delete highlight from there severs If over 100 Hours. I highly recommend uploading your runs to YouTube for the longevity if you fear of hitting that mark. I have added the info in to the rules set about submissions to help avoid lost runs and such.

• Submissions must include a permanent link to one uninterrupted video recording with intact game audio.
  • Twitch stream VODs self-delete after 14 days. Please upload your runs to YouTube or Highlight the run on Twitch.
  • If you have over 100 Hours of Highlights on Twitch, It may disappear from the severs before mods can view them.
• Submission videos must clearly show the main menu before each attempt.