Flights: Stockholm - Beijing - Singapore - Stockholm

Hi dear,We are grateful if you could help us and answer our questions in order to plan to buy air tickets from Stockholm to Beijng and then from Beijing to Singapore, and from Singapore returen back to Stockholm.
We will arrive at Beijing airport on November 1st. at 08:00 in the morning.
What date and time, we have to be up at the passport kontroll, approximately ?. Thank you so much for your help