What three DC Comics (or just characters is okay) have you read the longest-- off and on is okay! Make a note of it if those books/characters are also the longest runs you’ve ever had!
Titans (Teen and other wise) Yes, several long runs make an impressive number of comics-- but I got a lot as back issues
Batman - As many issues as I could get of any bat book, and really long runs starting somewhere around Len Wein.
The Flash - One of my earliest complete runs, and the full run of Wally