Let's hope it's 3 episodes, as many here have stated. However, the studio knows this fight is a cash cow, so it's likely to be loaded with filler - before, during, and just prior to the "Goofy Goobers" moment.
Let's keep in mind that there probably gonna have there best Animators animating this fight. If that's the cast there's gonna be a ton of extended fight scenes and filler fight scenes. Just look at Kakashi vs Obito, If they didn't add those extra fight scenes the entire fight would've been like 30 Seconds.