Artificial valves last roughly 10 years, typically. Sometimes more. You have to take antibiotics at the slightest sign of any infection, to avoid infectious settlement of the valve.

A family member got a "tissue engineered" valve a few years ago, so the cells (from a human valve, salvaged from the recipient of a heart transplant) were removed, and can be colonized by body cells, very mild to non-existent rejection. This seems to be a permanent solution.