How long will my husbands immigartion appointmant take in Juarez?

My husband will be having his first immigration appointment in Juarez next week. Does anybody know how long it takes. His appointment is at 830 am. Do they really follow appointment or is there a huge line? Hos about his medical appointment as well? He is 2 days before because we heard the line is long for medical appointment. What vaccines will they give him? He is unable to fine his shot records. One last question. Is it possible for them to give my husband his green card or is it a must he has to have pardon We were married in USA and he was illegal. Please help me with any answers. Thank you