As a parent how long would you support a child while they are chasing a dream? You've paid for college by?

taking out loans, which took them 6 years to complete because they got cut from one program due to lack of talent and had to transfer and they also failed some classes. If they picked a major they had some aptitude for they would have completed it in 4 years. You are paying off their student loans, they are still chasing their dream and living with you rent free. They do work, but their money seems to all go towards chasing their dream instead of bills. At what age would you say enough is enough?