I do think that Doctor Strange will appear as a way to explain the Multiverse to Peter, but I believe the bulk of the MCU Multiverse ramifications will be saved until next year’s Doctor Strange in the Multiverse of Madness.
Spider-Man: No Way Home won’t challenge The Snyder Cut for run-time superiority.
But I think that will be a separate future movie — one that Sony controls, because they struggled with sharing Tom Holland with Marvel, so I don’t see them handing Maguire and Garfield over without complaint.
It will probably be half of that length (a little over two hours, just like Far From Home), and will get to half of the rumors that have been swirling around.