Speculation is difficult to say with accuracy since all are just an educated guess, even just a guess. I would guess that Bitcoin will reach the 20,000 dollar mark from the time of this posting and 31st of January at 23:59 UTC. I believe that it is enough to break a new all time high. Bitcoin rallied within hours for a 2k USD increase and 6 weeks would be long enough to break the 20k mark.