According to the Maglev Corp offical website, here is the schedule of Maglev:
Long Yang Road -> Pudong Airport 7:00 – 21:00
Pudong Airport -> Long Yang Road 7:02 – 21:02
It runs at interval of 20 minutes sharp.
It means the train from Long Yang Road to Pudong Airport starts at
7:00, 7:20, 7:40, 8:00 ….. 20:40, 21:00
Please note that the top speed of Maglev is 430 km/h, which you will experience at day time. In early morning and late night, the speed will be reduced to 300 km/h for safty reasons.
P.S. This is the updated information for this old entry.