I'm curious: how much do you end up spending on coffee while at the coffee shop, and in how many hours? I find sitting in a coffee shop with a laptop comes with the expectation that you'll keep buying coffee, food, _something_ at regular intervals (which of course makes sense). The accepted intervals tend to vary between coffee shops. I was also thinking of working from coffee shops more at some point, but then I wonder how much I'll end up paying for the privilege..