The free trial is just the "prologue" to the full game, so when it's almost 5 hours long, you know something's not right. It's got missions a mile away from each other on this huge island that you need to use a car to get to.
The prologue in Far Cry 5 was simple. Clear this small island before you can access the other regions, and it was 1-2 hours. By the end of the prologue in 6, I was completely burned out.