Every weekend and bank holiday and every one of my 31 days off that I am allowed a year. I can't believe quite how much time off I get given, it works out as a total of 38 days, but I take all of it!
Days off are very important. Take up hobbies, see you family, live your life! Seriously, working every day, no matter how much you like work is so limiting. You end up with everything invested in one thing and so if stuff goes wrong in that one area of your life your whole life feels awful. By having other interests it helps spread the load. I might be having a hard time at work one day but maybe I'm in the best cricket form of my life! Or I may have been rejected from a journal but I have just mastered a complicated finger picking technique on my guitar. Or maybe my simulations crashed but meh, I'm going away for a long weekend with my wife. You get the picture.
(All just my opinion!)