How big is Oprah Winfrey's yacht?

I'm curious to know, just how expansive is Oprah Winfrey's luxurious yacht? Does it boast multiple decks, a helipad, or perhaps even a private spa? Surely, such a renowned figure in the entertainment industry would possess a vessel that reflects her impeccable taste and status. Could you elaborate on the specific dimensions, amenities, and perhaps even the estimated value of this impressive yacht?