My Threads is 84 minutes.
Which would make it the original broadcast version of the episode. Personally, I prefer the cut-down syndication version, as the longer cut has pacing issues and really feels ultra-padded out. The synidcated version is tighter and esier to watch. Unfortunately, my favourite scene is removed in the syndicated version.
Yeah, I know we haven't covered Threads in this, er, thread yet. But I think I left things vague enough and without spoilers here.