There are roughly 50 issues in a year for Shonen Jump minus the new year holiday and the other holiday, and Naruto have a record of skipping a week roughly every 5-6 weeks.... 1 1/2 year to go meaning there will be 65-70 chapters left, with the way things are going...
here are the branches that's not yet over:
1. Obito vs. Naruto
2. Madara vs. Kages
3. The War & Aftermath
4. Sasuke's resolvement
5. Uchiha's clan secret
6. Kabuto is not dead yet
7. Sasuke and Naruto (may) (bee)?
Regardless of how Mr. Kishimoto play it out, this will take longer than 40 chapters to not rush anything; with 30 chapters left, there's not much to do for an arc, just saying.