Usually Dec 18th is start of 2nd rut on my places, with most intensity Dec 20 thru 23. Should be right on time on my farms, as 1st rut was exactly on time.
The only thing I noticed different about this year is that 1st rut drug on a little longer than normal. I'm guessing that's because I had so many wet does compared to years past, so I had more than normal go into estrus a tad later. Normally my farms are dead Dec 1st and bucks are nocturnal, but I had more daylight activity the few first days of Dec in a LONG time