Make an estimate on how many times are you are distracted during an average work day.

Now take that number and multiply it by 25.

That’s how many minutes of concentration you’re losing. It takes an average of about 25 minutes (23 minutes and 15 seconds, to be exact) to return to the original task after an interruption, according to Gloria Mark, who studies digital distraction at the University of California, Irvine.

Multiple studies confirm this. Distractions don’t just eat up time during the distraction, they derail your mental progress for up to a half hour afterward (that’s assuming another distraction doesn’t show up in that half hour).