Wil and Penney work different shifts, though - bartending is at best an afternoon through early evening gig, but frequently goes 'till late night. Baristas start early in the morning, run through the late afternoon, into early evening at the latest (I know, in a big city there are 24 hour coffee shops, but this is North Hampton, a fairly small college town, and we have evidence that closing time is early enough for the whole gang to go to a bar...)
My point is that they've probably settled into the working routine of several couples I've known - he gets off in the wee hours, goes home and prepares a nice breakfast (waffles, anyone?). Waking his Penney, they enjoy a meal and some time together before she goes to open the coffee shop and he goes to bed. When he wakes, he has some time to himself, and when she gets off work, before retiring for the evening, she has some time to herself. Days they both have off (carefully scheduled) are a precious commodity, with the afternoon time that they are both awake spent together.
The result? Happiness, and very few people get to see them together. No reason each doesn't hang out some with their old friends during their free time, Wil with Sven in the early afternoon, Pen-pen with a good book in the early evening.
And of course, Wil stops by for some coffee before work, and Penney frequently grabs a drink (and something to eat?) after her shift, each grabbing a kiss before going their separate ways.
Some people claim that limiting the amount of time spent together is the best way to make a relationship last! You don't have the time to get on each other's nerves...