tbh this is kind of pointless but I've spent like 20 hours learning html for this so here's a website where you can see the relationship between video length and view count for all of Dream's and MrBeast's videos!
unfortunately, because this includes ALL available videos on both channels, Jimmy's 10 hour long old videos are stretching the x-axis with 3 23-hour videos, so to zoom in, click, drag, and release over the area you'd like, as seen in the gif below. To see the whole graph again, double click anywhere in the gray graph area!
you can toggle them both on and off if you're only interested in seeing one of the two, and hovering over any data point will show you the title, the video length, and the number of views circa 3 hours ago :>
you can find the website HERE!
as for findings, it's pretty difficult to really tell what works especially on Jimmy's end because he has so many videos, but for him and Dream, it looks like there's a positive relationship between the length of a video and view count. For Dream, there seems to be a sweet spot of around 30-50 minutes, whereas Jimmy's looks like around 15 minutes is the sweet spot for his videos' performance. But, just looking at what seems to be pretty tight regulation around keeping his videos between 10 and 20 minutes, I can imagine that's getting skewed a little yk