Quick question. After uploading a movie poster to the themoviedb, how long till it will show up when I refresh a movie in XBMC using themoviedb scraper?
it depends on how long it takes them to make it available - it can take up to about 24hrs.
It can take much longer than that to hit the API. This is a question better asked in their forums. IIRC it's actually in a FAQ somewhere over there. Regardless, none of us have any say in the matter.