When is it OK to move on?

I'm in the midst of a divorce which should be over somewhat quickly. Not a lot of issues to be worked out in it. I absolutely have no feelings, good or bad, for my soon to be ex. While I don't have anyone in particular in mind, if I met someone today that I found interesting, I would consider going out with him. My friends say I need to get over this divorce and my ex before I get involved with anyone else. I honestly do not have any feelings either way for my ex. The divorce is of my choice, not his and therefore, this is something I want. He was not a nice husband and the love I had was lost some time ago. I'm not looking for anything serious, but what's wrong with not waiting the obligatory 1-2 years as my friends have suggested?