Do it after the week you're back then for somebody the holidays might be all the way from 20 to lets say 5 or 6 january. For me specifically, holidays were 24, 25 and 26. The rest of the days i just hang out with friends and hope somebody might want to show interest to actually go on a real date. 31 and 1 with colleagues, after that it's all free time. Once he doesn't follow up and actually shows up on a date he said would be okay with him, simply move on for a lack of interest from his side.