Can I ask where you're from? The purpose that you seem to imagine coffee shops serve us totally foreign to me. Neither I nor anyone I know would ever dream of staying in a coffee shop for only the duration of a coffee. Either you're passing through and you grab a drink to go, or you've come to hang out for a while (either with friends or to pass the time in a "3rd space" working/reading/studying). All my coffee shop visits are either less than 1 minute or over 60. It would be truly bizarre to leave my apartment and spend 10+ minutes getting somewhere, only to stay for 5.