How long does a heart transplant take to perform?

Depends...: If this the first cardiac surgery perhaps 4 hours. If previous surgery, lvad, etc. It can take hours longer.

Depends: The surgery itself can take 4-8 hours. But then there's the organ procurement which can be up to 3 hours of transport by vehicle or jet and a surgery to get the organ from the donor. The whole process is usually a half-day or so, from notification to transfer out of post-anesthesia unit.