Legend of Zelda: A Link to the Past (started 1991, finished 2018)
Suikoden (started 1997, finished 2009)
Luigi's Mansion (started 2002, finished 2017)
Fire Emblem: Awakening (started 2012, finished 2019)
All games that I put significant time into, but for one reason or another had multi-year gaps in playtime before I returned and completed. It gives me hope of finishing other games that are in my deep, deep back-log.