Conflicts tended to last in the olden days. It took the Spanish almost 8 centuries before they booted the last Moor over the Strait of Gibraltar. England was under attack by the Vikings for almost three centuries before they succumbed in 1066. The Crusades lasted almost 200 years. And then you have the 100-year war and the 80-year war. Even later on, France was pretty much continuously at war with the rest of Europe from 1792 to 1813. Of course there were years when nothing really happened during those conflicts, but it wasn't really pace.
But in these wars you talk about the majority of the time nothing was happening. It wasn't a WWI style stalemate where the war was constant. And WWI only lasted a few years, not hundreds of years.
What I don't like is these WWI style stalemate that happen in the classical, medieval or renesaince era.
I don't mind it as much in the later eras because each turn represents less time. Also in the later eras warfare tends to become much more dynamic and stalemates are easier to break.