本人将持J-1签证进入美国，逗留3到4个月。我是在校学生，属于文化交流项目。目前工作已经安置好，签证也拿到了。6月份启程去美国。
如果在那边过得好，我想黑下来。
请问可以先黑着，然后再去申请美国的工作签证，直至拿到绿卡吗？拿到绿卡需要多长时间？
{"appId":"wx1584ddb8196cf859","nonceStr":"9rWLvJit6HK2xgmt","timestamp":1793739110,"url":"https:\/\/m.chineseinla.cn\/page_forum\/task_vtopic\/t_68428.html","signature":"cd3a7dc1524d890e1acc0b7520d977c66ae9de1a","rawString":"jsapi_ticket=LIKLckvwlJT9cWIhEQTwfJzoAC9i202iYxncayIKHHAUyW0iI8s-whBibNpFHTzLHZLa70v4iPF4--frRoYDzQ&noncestr=9rWLvJit6HK2xgmt×tamp=1793739110&url=https:\/\/m.chineseinla.cn\/page_forum\/task_vtopic\/t_68428.html","title":"\u5408\u6cd5\u5165\u5883 \u975e\u6cd5\u6ede\u7559 \u53ef\u4ee5\u62ff\u5230\u7eff\u5361\u5417\uff1f","content":"\u5408\u6cd5\u5165\u5883 \u975e\u6cd5\u6ede\u7559 \u53ef\u4ee5\u62ff\u5230\u7eff\u5361\u5417\uff1f","image":"https:\/\/c3.nychinaren.com\/images\/wx_share_logo.png"}
