Seasons happen about 15-17 days for about the same number of hours (roughly every two weeks); sows will only mate right at the end of that period. Usually the rumbling and whining will go up during this time, with the sow staying close to a boar while telling him at the same time they are not quite ready yet. This stage certainly doesn't lack drama! But you may observe that "husboar" and "sowfe" will reaffirm their bond with lots of kissing and cuddling on the day after a particularly wild time.
Thankfully, I find that with several sows in a group, they clump together to have their season, so I get only about two or three lots of several sows in season, not a sow in season every day. Equally thankfully, I get the really mad times only occasionally every few months. They contribute to deepen a group bond, though.
Boars tend to mellow as they get older, so you will see less of it as time goes by - unfortunately, neither gender ever stops being able to procreate, so the behaviour will never fully stop. Boars need to have the cooperation and acceptance of the sows they live with, so they have to constantly tell them what fine specimens they are and how much they fancy them.