Do I have to enter US within certain date to keep my US visa valid? Like the Canadian Landing Paper? " j8 _5 e! N5 h2 n" B8 c 5 o3 l3 h' _. u. f" TI did not see that on the visa. Or maybe I missed it. 0 L/ E9 X$ J0 t; r; K' B7 C7 K M" v7 s9 I% u# X% |. m