A guy I knew back in Florida- him & his wife text each other 20,000+ times per month. If there's a tiny crisis add 50% to the total.
When they were buying a house it was close to 50,000 text for a couple of months.
You can talk to him and he'll give very short replies- look at his phone and text. He doesn't remember a single thing anyone around him says- it's like he wasn't even there.