How long does it take them to mail a visa????

[thall9290 0]

My fiance (beneficiary) had his physical and interview (US Embassy in London) in early February 2010. He was told at the time of his physical that he needed a letter clearing him from Cancer that he had when he was a child (which he is in perfect health and has been for a long time). He was also told he needed an eye appointment and glasses. He was told that he could proceed with the interview (which was already scheduled for the following week). His interview went well, the gentleman that interviewed him was very nice, could see that we were really in love and that all they needed was the letter from his physician stating that he is in good health now. He was given the address for his physician to mail the letter to the embassy. He contacted his physician, told him what he needed and the letter was sent off to the Embassy in London on March 15th, 2010. We had heard nothing from the Embassy about his visa being issued so he called the middle of April. Standard response was "things take time, be patient". So, we waited a few more weeks and called again and got the same response. He has called the past 2 Fridays and gotten almost the same response "we can see that it should be mailed but it hasn't and we don't know why. be patient, things take time".

I hope I have done a decent job with the details of our problem with the Embassy. Forgive me if I haven't. I'm just a little worn out with it all.

My questions is:

When is it time to not be patient? I mean, can this thing drag on for months? Anyone else had a similar situation?

Any help/advice would GREATLY be appreciated.

Thank you in advance.