It would only take it about 100 days to walk half way across the world, so best case your looking at a year of freedom depending on who the whore sleeps with next. If you could manage to pass it on too crazy rich trust fund kid that spent all his traveling the world partying you'd be set but chances are it would spend 100 days walking to Thailand, kill a bunch of people there and start walking back to you.
Best bet is to youtube that shit, become insanely rich because you just proved the paranormal exists, spend your money and fame traveling the world doing interviews and letting scientist research it.
I really liked the movie, probably my favorite horror movie in a long time. Mainly just on the concept alone, something about having this slow moving but unstoppable thing coming after you works for me. Plus the soundtrack was great.