Or is that a 'how long is a piece of string' question?
First saw Ratty in the courtyard at the back of our house a month ago. It was completely my fault - put some old scones out for the birds and it attracted some blackbird fledglings, so kept doing it - might has well have put up a big ' Cream Teas For Rats' sign . Put out poison in three different places along the route where he/them seemed to be running. When we had them before (two years ago) I'm sure this worked in about two weeks, but although two bowls are now remaining untouched, one bowl still has a few pellets taken from it every other night or so. I saw Rat every day for four days after we put the poison down, but haven't seen any signs since then.
I guess this just means there are lots of them [yuk] There's nothing else that could be eating it, is there?
Oh and another question - if I keep the kitchen door open during the day, how likely
are they to come in? I've been keeping it firmly shut up to now, but am sweltering!