How long can a general internship in Nanchang Passenger Transport Section of Nanchang Railway Bureau take to transfer to high-speed rail?

Junior college internship turned positive after half a year. If the term of the labor contract is more than three months but less than one year, the probation period shall not exceed one month; if the term of the labor contract is more than one year but less than three years, the probation period shall not exceed two months; if the term is fixed for more than three years, the undergraduate internship with no fixed term will become a full member after one year.