Don't fly long haul...
Usually it is a "sterile cockpit" below 5000' or 10,000'. That means no non operation talk. After that general chit chat is the go. You soon learn when to be quiet ie radio calls etc.
It's a good reason to have "a life" outside work so you can chat about a variety of things. Helps the time pass and keeps every one just that bit more awake. Some fill out their log books, catch up on the newspaper cross word, it depends on the crew. (and company SOPs)
