Finally addressing the elephant in the room? I sure didn't expect someone to make a whole d̶o̶u̶j̶i̶n̶ serious book for the sake of it.

"Sazae-san spacetime", by the way, seems to be pretty much the Japanese name for Comic-Book Time. The trope page even says as much.

Levander said:

"Sazae-san spacetime", by the way, seems to be pretty much the Japanese name for Comic-Book Time. The trope page even says as much.

For reference, Sazae-san has been airing in Japan since 1969 and has something like 7000+ episodes. It continues to be set in 1960s Japan.