heat cycles

this is my first post, so im sorry if i do anything wrong or incorrectly. but basically I'm looking for guidance/help. my lady is on her 6th or 7th cycle currently. we've never done anything regarding it, though i have made unsuccessful attempts. i care about her deeply, and wouldn't ever hurt...

And how much for that time will she be bleeding compared to the amount of time she'll be penetratable

So as the title states, my Newfie girl tends to have a heat cycle just shy of 5 months to a couple of days past 5 months. I've only had her for 1.5 years and this has been the case since I got her. It honestly could just be normal for her. I've consulted with many more older and more experienced...