There are only six BWV GV's, reducing the chances for any time of year. It has been open at times in the past for at least six to seven days in a row during the first two weeks of Feb but which days and whether it is open long enough is more or less random. On July 1, 2018, 7 months out from Feb 1, 2019, it was missing Feb 5. By July 6, it was also missing Feb 8, and then by July 9, it was missing Feb 13 and 14.
Be aware that if AKV is a consideration, the Kidani savanna view GVs have typically been open every year at 7 months out for the entire time from Feb 1 to Thurs before Presidents Day and the Jambo GV's are sometimes open for a week but those six GV's tend to follow a pattern similar to that of BWV. The VGF GV's, despite having only six, and probably because of the very high point cost, have also usually been open at 7 months out for that Feb 1 to Thurs before Presidents' Day period.