You have two hourglass timers. One can measure 7 minutes and the other hourglass timer can measure 13 minutes. This means that it takes 7 minutes for the sand timer to completely empty the sand from one portion to the other.
Your task is to measure 22 minutes using both the timers in the shortest time after the task begins, that means your time starts after you start to play with the hourglasses until you can measure real continuous 22 minutes.
So how long at the earliest will it take to measure 22 minutes after your task begins?