Not very long. Sometimes it takes longer time waiting for your luggage than geting a stamp on your AP.
2. 我是今年三月同時遞交的140. 485,VSC. 140pending 打算六月中詢回國待三個月, 又擔心遇上打手印.有網上的朋友告訴我可以延期打手印的時間, 但我想知道延期的LIMIT是多少. 是否可以延到二,三個月以後.
Do you have your AP right now? Be careful before your I-140's approval. I guess you were not born in P. R. China, otherwise you probably cannot file your 485 due to the visa number availibiity.
3. 是否我和我丈夫的手印可以分開打.
It's really up to the USCIS (i forgot it's name, former INS). They will inform you separately. Sometimes you can do it together, sometimes not.
Good luck.