Turn into a stopwatch

Check your internal clock. How much they are accurate? Press the button with an interval of 1 second, and the game will tell you how much mistaken. After a short training on the first 3 levels, you'll be able to test their internal clock on hard level. How much time you will be able to count without using a clock with a minimum error? I, for example, after training in this game has managed to notch 1:00. 23 minutes. and wrong in the end only 5 seconds, can you imagine? And all this without the use of a stopwatch. Become a stopwatch!