It might take a while, it might not. The first time I left a post as a UPS teacher without another to go to it took just over a year of supply before I got a permanent post. (I did love the supply and there was plenty, but the lack of certainty worried me.) The second time I left with nothing to go to, I got a new post within half a term. Applying as an excellent teacher, for TLR posts especially, for a Jan start is always a good move.