If you've been wondering how long it takes for CBD oil to work in cats, the answer may surprise you. While there is no definitive answer, research suggests that it can take anywhere from a few hours to a couple of weeks for the full effects of CBD oil to be felt. However, it's important to keep in mind that every cat is different and will respond to CBD oil in their own way and at their own pace. So, if you're considering giving your feline friend CBD oil, be patient and give it some time to see how they respond.