from nanjing area to pudong airport

hello, do you think it's feasible and manageable if i have flight from PVG at 9.05 in the morning and i catch the subway/bus early in the morning from nanjing area to go to the airport? i don't have to check in anymore, bcs i only have an overnight transit (which is why i wanna walk around nanjing area at night), so do i have enough time to manage everything? (going from nanjing area early morning and catching a 9.05 flight)? if yes, what time do i need to depart from nanjing east station? thank you! and i hope someone would reply this!