Does the A33 bus run 2 times every hour as stated at the bus stops or1 time a day as stated here

I need to get to Pearl Island bus stop from Airport. My flight arrives in HK at about 4:30 PM on Friday26th May 2017. At the bus stops it says that the A33 service runs 2 times an hour morning until evening . On this site it says it only runs once a day . Which is correct