The cardiac angiography procedure typically lasts about 15 minutes for individuals who have not undergone previous heart surgery. For patients with a history of bypass surgery, the procedure may take 20-30 minutes. After the angiography, the catheter is removed from the access site, and pressure is applied for 15-20 minutes to stop any bleeding. Once hemostasis is achieved, a tight bandage and a small weight are applied. The patient is then required to rest in bed for approximately 4-6 hours under observation. Following this resting period, usually around the 6-hour mark, the patient is assisted to stand and is subsequently discharged.