Wasn't sure how to answer. I have dozens open, but none of them currently contain wine. Some in the recycle bin; some of the more interesting colors/shapes repurposed as vases, knick-knacks, or craft-projects/decorations. Some in the basement as fodder for future craft projects. I have an empty Jeroboam (or Rehoboam, can't remember which) in the basement waiting for a purpose.
But if you mean how many bottles do I have open with wine still in them, the current answer is zero. That number will grow to one or two this evening, depending on whether SWMBO wants red or white. (I'm opening a red.)