It is estimated that more than 96% of households with cats become accustomed to the Litter-Robot. It is normal for some cats to be initially wary or unsure of new objects in their territory. However, many cats begin using the Litter-Robot within a few days to a week of installation. The Litter-Robot 4 is designed to be as cat-friendly as possible, incorporating QuietSift® technology that keeps noise to a minimum during the cleaning cycle. The cleaning cycle only begins a few minutes after the cat leaves the automatic litter box. You can also set the cleaning cycle timeout up to 30 minutes, which may work better for fearful cats. With a little patience and encouragement, most cats adapt quickly to the Litter-Robot 4.