>>3418747From a publisher's perspective, volume releases have historically had around 100 pages. The unfinished volume 10, currently has 80. So there are about three more chapters remaining in that, putting a likely release in late summer or early fall.
There will be at least a volume 11 to finish up. Average volumes are also 15 chapters. So that gives us 18 chapters in 120 pages. 120 pages to wrap everything up is a bit rushed, but doable. I don't think it's likely to stretch to 12 volumes, but I do think it is likely that volume 11 will be longer than the others. But we can take those as a minimum.
1.2 months per chapter is pretty optimistic. Recent averages have been around 6 chapters per year. Which puts us more at around three years remaining. A real JK starting her first year now could graduate at the same time as Yuno.