How much is a barring?

[Chiefs Pantalones]

My car is making a long screetching sound when it's running. It doesn't do it when I first turn it on after it's been sitting awhile, it sounds normal then, it does it after I drive it for about 10 minutes. Then, when I get to somewhere, turn it off to go inside, then come back out it does it from the start. I think it's a barring. I know it's not the timing belt. At least I hope not. How much is a barring? I'm dumb with cars...