[elmokki]

Well, while there are things that don't make sense in terms of realism in castle creation, not speeding castle building up by having more commanders build it totally makes sense.

I mean, it's not like you double the hours spent working on the castle by having two commanders build it instead of one. By all logic the ones doing the actual building are people living in the province / neighbouring provinces / your soldiers. Your commander is just supervising that all goes according to plans.

If you wanted realism, if anything, castle production speed should probably be dependant on amount of available workforce and resources on the province or neighbouring provinces. Building a castle in the middle of a huge barren desert should probably take ages compared to building a castle next to a quarry in a province with huge amounts of people.

Then again the current system is easily good enough.