Maglev & Metro Pass // Pudont International Airport -> Yuyuan garden and Back

Hello,

I have a Layover of 13h, I want to use the Maglev/Metro and visit the Yuyuan Garden.

I have found the following information:
"Maglev Single Trip + Metro One-day Pass: It costs CNY 55 and allows passengers to take a single maglev trip (economy class) and unlimited subway rides within 24 hours;"

Can i Buy a Pass to pay both Maglev Directions? Or do i have to buy the Maglev ticket a 2nd time before i go back?

Thank you very much!