S2 Visa Extension Documents

Shiva, you cannot extend it for 60 days because the extended duration cannot be more than the original stay duration.
But it’s possible for you to extend it for 30 days at the exit and entry administration of the local PSB. The required documents are as following:
1. The passport
2. Temporary accommodation registration form
3. The completed application form attached with a passport-style color photo
4. Your residence permit
5. Family relationship certificate and other relevant materials the consular officers consider necessary.