Pre-rolled joints are a convenient way to get high without smoking raw cannabis or having to roll a joint. The effects of pre-rolled joints are often determined by the length of the joint, but there is no clear consensus on how long it takes for them to kick in. Some people say that it could take up to an hour for the effects of pre-rolls to set in, while others say that it could take 10 minutes.It generally takes about 3 to 6 minutes for a joint to fully smoke.