End of Feb if the past 3 years have anything to say about it.
2017 - drop Jan 4th, back up Feb 17th
2016 - drop Jan 10th, back up Feb 20th
2015 - drop Jan 12th, back up Mar 3rd
If the situation is so, then the market will recover in February or March later. I also believe that this is the right time if you want to buy back to add future assets.