Number Of Entries and Attestation

Hello,i am from Ghana and i`m trying to apply for an x visa to study in china.Please,in filling the forms,what should i write under the section which ask about "longest intended duration of stay"? Finally,i have all the required document but with the bank statement and physical examination record,i understand i am suppose to get it attested at the court.I went to the court and they stamped both document with a certified copy stamp and signed it.Will it be accepted ???