Strange...we were given the same exact choices on the day we were going in December and that was at the 180+ 5 days range. So I checked various days and it seems I am roughly always given something in that range...before 8 or after 9:15.
Does California Grill not seat anyone between 8 and 9? Just wondering if anyone does have reservations for that time frame.
We made the same choice you did and plan to ask to wait for a window table when we get there figuring that might push our time into the 8:30 range I wanted anyway.
Be sure to take a jacket. It can be cool in December from the 15th floor observations desk. If you do not get a window seat, going outside, while cool, is very nice.