[quote=@Willy Vereb]Generally when two major powers duked it out that rarely lasted for less than 10 years.[/quote]

Almost the entire length of this war is one siege, which wasn't even fully drawn out. It's ridiculous for it to have taken decades. Cities under siege are generally able to hold out for months, not years, and the man in charge of the besieged party gave up (marching his men beyond the walls to attack the siege party) well before it was necessary. Hell, it's feasible for the entire war to have occurred in the space of less than a single year. Even making it a few years long could be excessive.