Little bit less than a day now...everything seems good. Calendar flipped to next day. Watch is running about 2+ seconds fast.
Standard for the Seamaster Pro is -4 to +6 seconds daily so it appears to be well within automatic watch tolerance for this 16 year old watch.
(I bought it new via order 16 plus years ago from my then local jeweler's shop...I'm not sure of the exact date of manufacture...but it's within a year or two.)