The appropriate amount of time to start a relationship and have the obligation of bringing them home to the family for the holidays and/or buying gifts. The ideal date is a minimum of 2 months before the holiday: October 25.
Any relationship started after October 25 doesn't necessarily qualify as a mandatory invitation to visit the family or buy gifts.
If he doesn't get his act together, he won't have anyone in place for the Christmas Cut-Off and he'll be the only single loser of the family.