回複：J1簽證能申請綠卡嗎？J1簽證的續簽需要豁免嗎？

不知道J1簽證能不能申請綠卡，yes, but at the time of I-485 adjudication, you need (j) waiver, provide proof of fufilled 2 years home residency or proof of not subject to HRR requirement.

有要求去美國多長時間的要求嗎？GC eligibility has nothing to do with your non-immigrant status (except for out-of-status) or how long or have you ever been in US. Thousands of people each year arrive in US their very first time and get GC the first ever day in USA.