Do I have to enter US within certain date to keep my US visa valid? Like the Canadian Landing Paper? ! [, T" q7 c7 T6 q5 f n1 r5 Y4 Z ! g6 t9 B4 C. w# `% kI did not see that on the visa. Or maybe I missed it. ' \- d1 x6 w. x6 C) x6 |* Q- j7 X Q, S8 e M+ X