Glad to see the new thread. At the end of the old, we were discussing Chef's Table reservations. Thought I'd share my experience. I have a split stay: 1 night, followed by 3 nights. At the 180 day mark for my first stay, I attempted to book Chef's table right at 6am EDT online and it was unavailable. I am not sure if this is because CT doesn't go through the online reservation system, or that it was truly not available for that night at that time. I was able to book QV Room at any of the 4 times for that night, so I went ahead and secured the ADR at 5pm.
At 9am EDT, I called the V&A reservations number and spoke to a very nice lady who advised me that CT was already booked for that night 180 days out. She was also nice enough to look at our entire stay and let me know that CT was already booked for all four nights. She offered to put me on the wait list for any/all nights and suggested that I book QVR as backup. QVR for the 2nd night of our stay (my husband's birthday) was not available, as they have a private event scheduled in that room on that night (I had not heard of them doing this before, so I thought that was interesting.).
Although I was not at my 180+ mark for the second part of my split stay, the CM added me to the wait list for all four nights. She was also able to tell me that for "some nights" I am first on the wait list, while for "other nights" there is already someone on the wait list. She didn't say how many or which nights, but I assume 2/2 based on the context. She said I have a decent chance that someone will cancel and we will be able to do CT one of our nights.
She also confirmed that there was no reason for me to call back the next morning to check availability for the second part of my split stay, which was nice, since I'm on Central time, rather than Eastern.
I hope this info is helpful to someone. We are going during the first week of F&W Festival, which is a slow time of year, but we know there will be lots of foodies there. Also, it's a weekend, so I assume maybe some locals will be at V&A, making it tougher to get the CT.