Have you ever worked on a project that lasted multiple years?

"At [X company], I was responsible for the management of all related duties pertaining to [X project] over a 3-year period. I thoroughly enjoyed working on such long-term project as it enabled me to completely immerse myself and become the number one expert in all company matters. I furthermore enjoyed the strong relationship established with the client and was grateful for the level of trust he had in me and my work. I ensured to never take my duties for granted, always conducting my due diligence on a regular basis and making sure I learned all current and upcoming areas relevant to the project."