That's really true And you are right about over hours. Why should I work more hours and receive money only for 40 hours a week? But sometimes(I mean my case) if you like your work and project and it is intereting to you to do this job, why not to work a little more for example, because sometimes you should finish task today - for your own purpose - not to forget smth. tomorrow. But I said that only for 1-or max 2 hours a day and only sometimes, and you can use this hours if you want for example leave work in friday earlier.