匈牙利铁路 需要提前多久才能预定票子呢？

如题，我需要4月20好预定维也纳到萨尔茨堡的铁路票，现在上http://www.mav-start.hu/english/index.php预定后，显示“Please note that home printing of international tickets is not possible. International tickets booked online must be collected at any of the Ticket Collection Points located at railway stations in Hungary before your journey. ”