Some of the best advice I've ever had was, "when you start at a company, it's tempting to try and work your arse off to prove how worthy you are. Don't - you're not proving anything, you're just establishing precedent. Instead, quickly determine what the absolute minimum you can get away with is and do slightly above that. Then work harder for the month before review time so you can justify a raise. The extra effort will be noticed now, but if you'd worked your arse off then that would just be normal behaviour."