Sounds about the right age. He'll get bigger and more assertive as they age, and eventually she'll long for his *ahem* company. It takes longer with some birds than others when it comes to pecking order. I've never had two go at it for days straight, but I have seen short spats (few minutes generally) that happened sporadically over days, weeks or months between the same group of birds.
If a tom is already around when girls are growing up (even if he's not much older), I've never seen the girls reject his authority. If the girl is older than he is or if they've grown up together from poults, I've seen dominant hens challenge the boy(s). Female-male dominance battling isn't as long and fierce-- in my experience--as male-male. As soon as she starts getting ready to lay, she'll acquiesce, if not we'll before.
