In my opinion it has issues, but length is not one of them.
If anything, I thought it was too short. They didn't go in-depth into anything in the 2nd half of the movie, felt like they were racing to the finish line...
The first movie was dedicated to the software industry in the UK and touched very little on the HW itself.
This new movie can't decide what it is - first ~70 minutes are about the Amiga HW history & development (nothing new here).
The rest touches on the Amiga market impact (especially on the few SW people interviewed) and a little on software milestones (again, not enough).
The part discussing piracy & the demo-scene should have been much much longer, IMO.
Overall I enjoyed it, but wished it would run an extra hour & go more in-depth on everything but the HW.