How long does a quadruple heart bypass take?

4-5 hours. Variable most times from start finish operating room stay 4-5 hours . You mat want to ask the doctor.
Depends. Like any operation, length depends on complexity, comorbidities, and any immediate complications. Also, what do you mean by how long? How long does it take to do just the bypasses? How long of a time is spent on cardiopulmonary bypass? How long are you in the operating room? Etc. Having said that most bypass operations take from 3 to 6 hours "skin to skin" from incision to closing.