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