The number of Le Yan Dian is displayed on your dashboard prior to you clicking on the 'TAKE SURVEY' button.
The amount of the reward will vary depending on the length of the survey - the more time required on your part, the higher the amount of Le Yan Dian.
Please note: There is a slight delay of approximately 15 seconds for Le Yan Dian to be credited to your Le Yan Dian balance, once you complete a survey. You will see a circle rotating on the internet tab browser you are participating from, once it stops rotating, you should see the Le Yan Dian added to your balance.