Crimson-Flazey said:

Well, I made it this long in case someone wants to download and watch it on their computer, so it plays a good amount of this animation before jumping to the next

As for the stutter, probably because that is very last (or first, not sure right now) of the animation, and believe me, this is the most fluid version I could make of this.

I do actually check animated files I upload first locally with MPC-HC and with phones Google Photos app. Both of these loop the content near seamlessly, which makes it easier to see if I fucked something up.

Windows Media Player and "Movies and TV" app also work quite nicely, latter even allowing viewing the loop in popup player while doing other stuff on Windows 10 PC. Only VLC has major issues when looping content, suddenly resizing window and other nonsense, PSA: please avoid VLC in general.

Also I would see the issue other way around, videos playtime being so long, now viewer is thinking there's something changing at the end. Alternatively they play it locally without checking loop function from their media player and then suddenly get switched to next video.

I still fail to see the point to looping the loop this many time. It's mostly just bloat and annoyance for majority. I can understand looping loop couple times to avoid hitching if device is struggling with video in general, but only couple times, not thousand.