I never call at 7:00 AM since the phone lines are clogged then. I waited until after 9:00 AM and had to call twice because the first time, I could barely hear the Cast Member. The first time, the call was answered (as in the Cast Member was ready to take my reservation) within four minutes. The second time (about five minutes after I hung up from the first call) was answered in six minutes. I got what I wanted, Le Cellier for lunch on May 24th for 1:05 PM.
I'm one person who doesn't feel the need to have tons of dining reservations for all the hard to get into places for dinner. There are plenty of other options available.