I had to register my new bike and renew the tags on my wife's car today. I went to the DMV at about 9:30. There were maybe five people in line. Took about five minutes to get up to the counter and maybe another five minutes to get my new license plate and tag renewal done.
So if you have to go - do it in the morning. The times I've gone in the afternoon or around lunch time I have had to wait about an hour to get the job done.