I'm sure it can vary between a week and every day, but as I said, 2 years with dart frogs and this is the first time I caught them. I've known that they do it, and what to look for but still today is the first day. I have a feeling my older auratus' have never been caught is because they are in a heavily planted terrarium, this one just so happens to be new so is still in a 10g quarantine tank with only the bare necessities. Also this particular frog is the most active frog I have seen, even on the dive home it was trying to pop the lid off it's cup where as it's tank mate slept, so it made no attempt to hide.