Worst thing in life is waiting. Ok. I might have to take that back. Waiting in traffic is pretty bad. Mine is more about once you have done a casting and you wait. You wait for the responses. You wait for people to figure out their schedule. It is time watching the clock and wondering if you are going to get the answer that you are looking for. It is the wait.
The best thing for me to say to you who are also waiting is to make sure that the person knows that you are waiting. Your time is valuable and if you offered them two dates. Let them know that those dates are not going to be on hold for them forever. That you can make your wait shorter with a little nudge in the right direction.