For this, you need to have more than one hand. You can use one but it is more difficult.
Step 2: Step One
Extend your arm fully so that your first hand is covering the sun. (so you do not lose eyesight) You do not count the hand covering the sun. I did not make a hand to cover the sun so that you could see where it is.
Step 3: Next Step
Do the same as in step one with your other hand, but place under first hand. The blocks represent hands.
Step 4: Step Three
Keep going while counting until you reach the horizon. So in this picture, the blocks represent hands. There are about 4 hours of daylight left.