A coffee shop I used to work at semi-regularly [1] had a sticker discreetly placed next to the power plug, under the table, requesting that you spend around $5/

A coffee shop I used to work at semi-regularly [1] had a sticker discreetly placed next to the power plug, under the table, requesting that you spend around $5/hr if you're going to stay for an extended time. Seemed like a reasonable rule of thumb. I also like that it was done more as a "friendly reminder" / request, not in a heavy-handed manner, like the places that give one-time-use wifi codes that expire every hour. [1] http://www.cafeugly.com/ http://www.cafeugly.com/