Hello @Greg
There is no maximum number of days for arrival in the territory, and that’s a good thing. Personally, I think you can indicate two weeks before your start date.
In general, the embassy will first process the files of students who start in August-September. So don’t be surprised if your file takes several months.
Also read: Foreign Students: Discover 4 Good Reasons to Have Your Driving Licence Before Arriving in France!
Good luck!