The small child Ryu "arc" only lasts around 10 chapters and it's mostly character introduction. And, while the middle school part is longer, I just looked back at it and funnly in ch 77 he states that he stays in japan. Yes, there are some chapters from that summer and after the championship, but in real that arc ends the same chapter as Bungo's
It's just feels longer cause at that point it's inculed 2 whole year they spend in that team, not just 1 tournament.
Also, after their announced 4 victory we jump over entire tournaments. Or just like the first year highschool after they win the selection, they skip over the matches in 1 or 2 ch until they lose at the free kick.