Zelda is at the top for me as well. I've played every mainline game, and every spinoff released outside Japan with the exception of Triforce Heroes (I consider it a spinoff regardless of the time line).
After that, probably Mario or Pokemon if you include spinoffs, Fire Emblem if you don't. Megaman if you include every sub-series.
Not the OP's question, but Fire Emblem wins for overall time for sure. Not only are the games medium-long to long generally, but I've played every title before Awakening at least twice. Path of Radiance I've played 6 times at least, which really adds up.
NNID: Zephyr25 / PSN: Zephyr--25 / Switch: SW-4450-3680-7334