when i first read this, I took it to mean you were asking somebody from the forum for a LOR. I don't think this is what you meant, but I believe that is unethical and inappropriate to try and get one just because you have to. That aside, and trust me...I'm not hating, if you go to somebody you trust and who is qualified to write you one, give them a few days. You tell them the situation, apologize profusely, but state the seriousness of it. If they are a true mentor, they can probably bust one out in an hour. If they respect you, have the time, and truly want you to succeed, it should not be a big deal. They understand the importance of the LOR. Best of luck!