Are you running that tight? You are making a trip but on your return, you have it planned out that you'll be broke by that moment? Bro. If you don't have any tip money left over when you go out to eat in a restaurant, don't go to the restaurants. That's the best option I can give you. Or try and spend less in Greece and manage your funds a little more carefully so that you can cover 26 hours in MAD. What kind of lounges are you talking about in Madrid? The membership lounges or lounges in general? Need money for those too. Unless you had bought membership when you had a job. You haven't even left country yet and you're crying poverty.