This is another one of those questions that can differ from person to person. If you do not feel the CBD effects immediately, give it some time. You can slowly increase your dosage as you go if you feel you need more. Sometimes you will feel the effects of CBD right away. This is especially true if you choose to vape CBD. Other times you will only feel CBD hit you later — like if you choose to digest CBD in edible form, although effects are usually felt whithin the hour or less.