Word of Tom is that time in BattleMaster is the same as time in real life. It's just that seasons pass quickly.
I like this, but I'd like the addition of an age that is function of time only. I don't think that real time works well for character age.
For example, I had a character on BT during the invasion that took some critical wounds. I had made him the grandson of my oldest character, but the critical wounds pushed his apparent age enough to make him my oldest character.