Late flight (9:30 pm). Need to go through customs. Enough time to get metro?

Generally speaking, it takes about 1 hour to check out. The SMT operates from 7:02 to 21:42, and there are two extra departures at 22:15 and 22:40. It takes 8 minutes to reach Longyang Road. The last train of subway line 2 departs from Longyang Road at 22:54. Hence, it is likely that you can catch them if you hurry up.

Also, you may take shuttle bus line 2 to Jing'an Temple Station, and then take a taxi to your destination. The bus line operates until 23:00 at T1, and 23:05 at T2. U can surely catch it :)