优选答案
你好，关于485学历移民局官方原文明确要求：
that were completed as a result of total of at least two academic years (92 weeks) study
that were completed in a total of at least 16 calendar months
因此建议最好还是选择2年的研究生就读。但是可以选择在1年半时间里读完两年的课程。
具体你也可以查看官网对于Australian study requirement的详细要求：