From shamrock hotel to Beijing airport my flight 0745. Morning. Wher I can wait and what s time for bus

Theoretically, you can wait airport shuttle bus line 1 at Dabeiyao Station around 05:20 to the airport within 35-40min. However, in this way, time will be tight to catch your flight. I suggest you take a taxi to travel from your hotel to the airport at dawn (around 04:30 or a little late) to catch the plane.