lol...
well this question is loaded... it depends on sooo many factors...
what type of anemone is it? purple tip says to me a condy or a sabae... if its a condy they will probably never host as it is not even a natural host for ANY type of clown because it is from the atlantic... i have heard of clowns hosting those but i have also heard of them eating anything and everything that touches it, including clowns...
are the WC or TB? WC tend to host faster than TB but either one could take a day, a month, a year or longer... or it could never choose to host in the anemone...
there are just so many factors...