What is the longest-running manga series that has already ended before september 2016? Ah! My Goddess manga has run from september 1988 to june 2014, and that is 25 years, 9 months.

Of the manga series that have already ended by this posting (before september 2016), what is the longest-running one?

Is it Ah! My Goddess? Or is there an even longer one?

I'm more interested in the time between the first and the last chapter, but if you can in addition to make a point for the one with more chapters, that is also acceptable
The series mentioned by senshin in the comments are hard to beat. But here is a new record:

Chiisana Koi no Monogatari (小さな恋のものがたり) ran for 52 years, from 1962 to 2014.



It was created by Chikako Mitsuhashi and published by Manga Time. A total of 43 were published.

Sources: wikipedia and myanimelist.

According to the same wikipedia article, the record to most chapters seem to go to Sazae-san, with 6477, and the one for more volumes published to Nijitte Monogatari with 111.