Bet on 4/5 years, Oda clearly want to end it fast, and its basically the last saga
Think will be something like:
Egghead (15chapters)
-Vegapunk give info on the fruits
-Bonney and Kuma past
-Vegapunk deal with Kuma
-Hint on last Road Poneglyphs
-Start the plot leading to the conflict against Teach(Koby/Caribou plots will lead to that)
Vs.Teach (95chapters)
-SH find the last Road Poneglyph (Elbaf?)
-Caribou give info on Weapons to Teach
-Teach get Pluton (could use it to defeat Shanks?)
-BBP try to capture Robin to get the four Road Poneglyphs (Kuzan plot connect in this part)
-SHP vs BBP
Laftel (20chapters)
-SH get there
-FB about the Void Century (kind like Kalgara and Nolland one)
Vs.WG (80 chapters)
-SH and allies invade Marijoa
-Basically a big battle royale of Luffy minions vs Imu minions
-Law undo Imu immortality
-Luffy defeat Imu
-Red Line destroyed, FI moved, Laboon meet Brook, All Blue formed, etc