Many frequent flyers stand by the fact that if you keep yourself hydrated and get plenty of rest the effects of jet lag should go within a few days. However, there are some other ways to stop Jet Lags effects and there are remedies to stop you getting it all together.
Guangzhou to Riyadh jet lag information
Lets assume you left Guangzhou at 9:00am. The flight takes approximately 8 hours 9 minutes so you would arrive in Riyadh at 9:12am Guangzhou time which is in fact 4:12am Riyadh time.
Your body will be telling you that its 9:12am but actually its now 4:12am