DH and I spoke everyday when we first got together - just a general back and forth throughout the day and we saw each other every other weekend. Facetime maybe 1-2 times a week for rude purposes only cos we were long distance.
As we got more established (6 months onward) we'd generally have an evening call 5 nights out of 7, unless one of us was busy. Just for 5 minutes normally to say goodnight, but sometimes for longer.
After that we'd call each other while we were commuting in the morning, at lunch, whenever really - we just like talking to each other haha. And messages in between, nothing exciting just general chat.
Now we've lived together 6 years and we still call one another at lunchtimes if we're not together, and message some of the day.
I think there's an age/generational thing - my mum for example would think it was insane to be messaging someone back and forth all the time, but I have a handful of group chats that are active 80% of the day, so messaging my partner regularly isn't a particularly surprising thing. I don't see it as a particularly time consuming thing, if I've just got to work and parked my car I might take 10 sec to reply to a message before I get out, if I'm waiting for the kettle to boil, whatever.