No one is going to view it during the Christmas period, the only reason to put it on during that time is if you think you're gonna get eyeballs on it over the holidays to set up viewings for the new year.
It may be different north of the border, but when our purchase fell through in October last year, our agent told us we basically had a month to find somewhere new, as December is their quietest month by some margin.
Early January. No-one wants to host house viewing over Christmas.