My little guy, 6 months old is home all day while I am at work. This is about 9 hours a day. It was hard at first. Now...he is fine. No problems at all. He doesn't even look out the window when I leave anymore!!!!
I must say...I miss that.
Some helpful tips... Before actually leaving the house for 10 minutes, just go outside where he can't see you for about 10 minutes. If he cries...do not go in! Ignore him. Once he stops after the 10 minute period, go in and give him a treat. Next time, try it for 20 minutes outside leaving him indoors. Again, if he is crying at 20 minutes...don't go in until he stops (you don't want him to get the habit of crying and getting your attention). Then I would suggest leaving the house for 30 minutes and returning with a treat for him. He will learn that being left alone is not a bad thing and can sometimes be rewarding!!!
Leave tons of toys out. Turn the radio on. He will be just fine.
You might want to practice this more often, so that when you are away from home and have to leave him he will not have seperation anxiety. Not healthy for him or you!
Good luck