Longest Running Manga by Volume Count (1-50)
Manga
No. 11 is Senri no Michi mo by Ippo Ohara & Satoshi Watanabe, which started in 1989 and ended in 2022 with 134 volumes & 693 chapters in Weekly Golf Digest.
No. 22 is Hakuryuu, which started in 1996. I have put Hakuryuu Legend instead because I could not find an earlier version.
No. 23 is Kowashiya Gen by Hoshino Hideki & Sadayoshi Ishii, which started in 2003 and is onging with 108 volumes & 1028 chapters in Weekly Manga Times.
No. 40 is Kabachitare! by Takashi Tajima & Takahiro Kochi, which started in 1999 and is ongoing with 93 volumes & 974 chapters in Weekly Morning Kodansha.
No. 47 is Impact by Nobuhiro Sakata & Ryouji Ryuuzaki, which started in 2002 and ended in 2019 with 85 volumes & 851 chapters in Par Golf.
Number of volumes and chapters in notes.
No. 22 is Hakuryuu, which started in 1996. I have put Hakuryuu Legend instead because I could not find an earlier version.
No. 23 is Kowashiya Gen by Hoshino Hideki & Sadayoshi Ishii, which started in 2003 and is onging with 108 volumes & 1028 chapters in Weekly Manga Times.
No. 40 is Kabachitare! by Takashi Tajima & Takahiro Kochi, which started in 1999 and is ongoing with 93 volumes & 974 chapters in Weekly Morning Kodansha.
No. 47 is Impact by Nobuhiro Sakata & Ryouji Ryuuzaki, which started in 2002 and ended in 2019 with 85 volumes & 851 chapters in Par Golf.
Number of volumes and chapters in notes.

Manga, 200 vol, 1976
Me:-
Author:-
201 volumes & 1960 chapters

Manga, 5 vol, 1986
Me:-
Author:8
136 volumes & 977 chapters

Manga, 72 vol, 1999
Me:-
Author:9
72 (Naruto) + 24 (Boruto) = 96 (total) volumes & 700 + 97 (Boruto) = 797 (total) chapters

Manga, 27 vol, 1992
Me:-
Author:-
93 volumes & 734 chapters