For what it is worth...

Morning crossing on major US Holidays (such as Thanksgiving, Christmas, New Years, etc.) are usually very quick.  The reason is on a major US holiday few people living in TJ cross into the US to go to work.

During the Christmas holiday season expect lines to be longer than normal.  Mexicans with visas will be crossing more frequently than is the norm to shop in the US.

New Year's Eve is usually has the least chica availability in the Zona of any day of the year.  It is followed by Christmas Eve, and May 10th (Mother's Day in Mexico).  On these type of dates sexoservadoras with family and even extended family in Tijuana will take time off to spend the day with family, extended family, and often friends.

Also, of course, many chicas return to their home tow for the holidays.   Although the traditional dates for Christmas posadas is December 15-24, IMO the Christmas holidays begins on December 12th with the Virgin of Guadaplude holiday and ends on January 6th with the Three Kings (Dia de los Reyes Magos) holiday.  

Be that as it may, some chicas will extend their vacation through the February 2nd Dia de Candaleria holiday.  Yet others will remain in their home town until Spring or Summer.  (Most Mexican consider Tijuana to have a very cold climate and prefer spending the winter elsewhere.)

Feliz Navidad