Do I have to enter US within certain date to keep my US visa valid? Like the Canadian Landing Paper? / U, ]7 S! x" O O- V3 [- ], ]1 }+ p( h- EI did not see that on the visa. Or maybe I missed it. 1 r1 y# v& U& A% t4 S: S. u) m/ h# n; u2 ~1 @+ A( u! y0 e6 D* Q8 c" D