L.D.
My daughter is 13 months and my son is nearly 3.
I always listen to my heart. If it feels too bad to me, I go get her. I listen to the way she is crying - if she sounds mad, I leave her. If she is getting hysterical and getting worse and worse, and no signs of calming down, I go get her.
I think for the hard core cry it out method, you leave them no matter what.
I am not opposed to some crying and there are lots of nights where she cries for 5-10 minutes, but depending on her crying, I normally get her after about 15.
Everyone will give you advice on this but I think you should do what feels right to you as a mom. Different things work for different children.