I say around 150, with Honoka gone, and Yui coming next, there's not much material left. You could count the time between the year skip, but it's not going to have anything we didn't already know.
ehh, i think its going to dragged on for a while, i'd say 150+
looking at the lack of relationship progress in the manga so far (ch127), we can safely say that this manga is going to be stretched as long as possible
LoL..maybe suzuka will go like hajime no ippo:P
Well, considering that its already around ch. 140, I'd say it'd probably be ending by 160, but thats just pure guessing.
The way I see it, there are only 2 things that really need to be addressed before the manga end:
1. The track rivalry between Arima and Akitsuki
2. The specifics of what Suzuka did in America.
It's hard to think that the only thing Suzuka did in America was dick around and focus on track alone.
But hey in the interest of keeping Akitsuki and Suzuka together, and not dragging the manga longer than it needs to go the second one isn't as important as the first one.
Im guessing it would end in the 160-170 range.
you have nice points before the manga ends.
Im guessing the america part would result is something like:
1.> Suzuka reflecting and realizing how much she values her relationship with yamato and that shes not treating him right.
2.> Trained really hard to achieve her goals and signed some deals with a sporting company to become a sports icon when she breaks records and become a top athelet in the country.
3.> A fued between yamato and suzuka that suzuka had a fling of some sort with someone.
4.> Shes the bride of the shoe sales man that yuuka likes alot, not sure of her name hehehe.
Well, what another guess at what happened is: Arima and Suzuka actually got along well in the sometime in the middle of the trip in America, but Arima does something stupid, like go too far with an insult on Kazuki or something, and their friendship ends.
Yamato will end up only hearing part of what actually happened, and think too much, and will probably think that they had a short lasted relationship together in America.