Can I get out the airport for 53h of transit at Pudong Airport?

I'm actually in SH. I have no more entry on my visa which means that if I leave the country, I won't be allowed to come back for more than 48h of transit. Actually, I would come back in SH the 16th of january at 6pm but my connection flight to my home country is on the 18th at 11pm (So 53h later).
Do you think I'll be allowed to get out the airport for 53h since I have to pick up my stuff before getting back in my home country ?
Or, do you think it is ok if i go to the airport before 6pm on the 18th so that I won't exceed the 48h allowed...?

Thank you very much for your answers.