Gotta love the random insertion of Higurashi... BNHA doesn't really belong in this thread either.
Suffice it to say, almost no one on these boards has seen Sazae-san.
Probably haven't seen #2 Nintama Rantarō, #3 Ojarumaru, or #4 Oyako Club... either.
Doraemon is technically not ongoing as there have only been movies after 2005 and according to Wikipedia it is actually #5.
#7 Anpanman actually has a longer total running time than the #2 thru #6 at around 36,000 minutes because unlike the others it has full 24 min episodes. It still doesn't beat Sazae-san which has over 50,000 min of running time.