We are in Shanghai on 06 July while transit to India we having 12 hours stay over there.

The distance is about 13 miles (21 kilometers).
Upon arrival, you are advised to take Maglev Train to get to Longyang Road Station first. It just takes around 8 mins. Then transfer to subway line 2 to Luoshan Road and line 11 to the Park Station directly. The duration is about 25 mins.
Notably, remember to go back to PVG 2 hours in advance.