> It's a gentleman's game.

Cricket is a game that was designed for toffs to show off their free time, to each other and the plebs (including those making the G&Ts and cucumber sandwiches for the players and spectators) who couldn't take five days out of their lives for a match.

> Like golf

That too.

There is a reason why most other sports income 60/90/ish minute matches: people closer to normal had to squeeze their sports into what little free time they actually had, usually not much more than part of Sunday afternoons or maybe a bit of time some evenings.

> there are expectations of behavior.

While social contracts can be a good thing in terms of helping varied people people get along, cricket and golf are as important in that respect as knowing which of the four forks & three spoons on the table to use next. Etiquette in those forms is just artificial rules by which you show off how "civilised" you think you are, not sportsmanship or other genuine civility.