Short answers, pulled from the story.
The 1st of January 1938 marked the beginning of the ongoing series format with the launch of Action Comics. This publication date initiated a publishing phenomenon that outlasted empires and generations through constant renewal.
Detective Comics holds the record for the longest continuously published comic book in the United States with 881 issues published between 1937 and 2011. This title stands as a testament to the resilience of the ongoing series format.
Dell Comics Four Color series amassed more than 1,300 issues over a 23-year run. This total surpasses the issue count of any other title including Detective Comics and Action Comics.
Lumberjanes became an ongoing series that ran for six years and 75 issues after originally being planned as an eight-part limited series. The series ended with a one-shot finale in December 2020.
Action Comics published 42 issues weekly between 1988 and 1989 to surpass the total issue count of Detective Comics. This unique period allowed Action Comics to reach 904 total issues.
Mickey Mouse received its own numbering system with issue 28 in December 1952 after first appearing in 1943. The series ended with issue 330 in June 2017 from IDW Publishing.