Loading times..... those make me go the way you're topic is name. I make some sandwiches and tea , sometimes even manage to take a shower before it loads. And to add to my misery - patrolling for some weeks only to find 2 pt boats. Months of boredom in-game. Yeah I know it was boring like this in RL as well, but you know... I have been watching TV while playing the game more than sinking ships.
But when you finally get a contact it feels rewarding, unless that contact is a convoy which you are trying to get closer to only to get noticed by a DD escort and launch a whole salvo of torpedoes which miss as usually or even worse- go dud. Turn around dive deep and enjoy the firecrackers from you're helm for another hour or so. Ehh... I like playing on weekends more