I hate waiting for responses. It isn’t necessarily that I’m impatient. I can hang in there pretty well.
It’s just that once I know the usual response time has ended, I wonder what to do. Is it time to query? Should I wait another day? Another week? It isn’t so bad if I can send a friendly email to the editor, but sending through the post office? What if the original didn’t get there? (I know, send a self-addressed stamped postcard and get a response as soon as it’s there.)
If a response isn’t given in the time generally allotted, some markets just aren’t interested. Sometimes it’s difficult to know which is which.
Ransom Noble 
Waiting stinks. I have far too many that have been out far too long.
It is tough to wait. I don’t have much experience with the wait but have heard Mur talk about it on I Should Be Writing. I am in a wait right now and it’s hard. I sent “so i said to my shrink” to a magazine. It said to wait 3 months and it has only been two. I’m so nervous about it though.