It should take weeks if not months to get to 'F' status, which is meant to represent permanent fortifications.
This is not true. These are field works. Not concrete bunkers. Things like tank ditches, mine fields, wire, earthen bunkers, trenches, etc.
12.4 Fortification (Advanced Rules)
All Land units may deploy into defensive positions. The
presence of units with an Engineering Capability increases the
chance of successfully Entrenching or Fortifying. Even if a unit
fails to Entrench or Fortify, it will increase the local Entrenchment
Level, making it easier for that unit and others to Entrench or
Fortify in the future. Once created, Field Fortifications are permanent.
As the Entrenchment Level of a location increases, units
in the location will find it easier to enter Entrenched or Fortified
Deployments. When a location changes hands, the Entrenchment
Level is automatically reduced by 25%. Once ordered to
dig in, units will continue to dig until their location is Fortified or
you give them other orders.
< Message edited by Panama -- 1/21/2013 2:44:31 AM >