0 used to emphasize how much something is true or how much someone can do something:
I could eat this cake all day long.
We could go on citing such examples all day long.
I can read this kind of stuff all day, thanks for writing it!
You can deny it all day, but it's still true.
NYA ORD
European
May 10, 2021
DAGENS ORD
Shimmer
all day long