Below is a rough approximation of one of our networks. Lines are wireless links. This network is about 85 miles long and located in hilly terrain so no more wireless links can be easily added to shorten its overall path.
I've tried NBMA OSPF backbone area and while it works the convergence time is several minutes after any break.
I've used the default timing and redistribute connected routes.
Any ideas on where best to partition the area or other tips which could speed convergence?
Edit:Blue squares are Mikrotik routers.