Wait is that up to 100 hours assuming you don't skip through grindy things by holding ctrl? I know some games have repeatable things you do to grind up stats/resources and ctrl will skip through previously seen text which is something I've used multiple times before.
If you work through the whole story & take your time conquering fiefdoms, then waiting a while after taking them to let them settle down & troops + gold build up, build all buildings etc, before taking the next one, it will easily take you a good couple of days to finish the current continent. Possibly longer.
There is also side content with getting the conquered rulers back to the palace, either in the dungeon as sex-slaves, or in the palace as advisors (this gives advantages when conquering), then there are some tasks to complete to prove your worth before they'll let you bed them, I'd guesstimate there are a good couple of days, min of 48hrs+ actual time required.
I have been playing since close to the beginning & have easily clocked up circa 50-60 hrs, without skipping anything.