Is it appropriate to call a professor for a recommendation on the weekend? I emailed my professor about two weeks ago, but there was no response to my first email. I sent a follow up, and got a reply saying they'd be happy to write one for me on the following weekend. I waited, the weekend passed, and nothing happened. I followed up  again, and again no response to my email. 

Now I am thinking to call as a reminder. My professor has written many recommendations on my behalf, and my guess is that it didn't get done  due to  laziness or  forgetfulness. Now we have a long holiday coming for the next ten days and I want a recommendation as soon as possible. Is it appropriate to call  on the weekend given the fact that it was said that it could be written one a previous weekend?
No -- it's totally inappropriate.









Seriously. Think about it. Unless you're at a school where profs phone grad students at their home on weekends to inquire about a late paper, it's totally inappropriate. 


Note: Many grant agencies / admissions committees know that we (the faculty) are thorough flakes and couldn't be trusted to tie our own shoelaces in the morning. They usually give a few days of extra time for faculty references to come in after the deadline.  Others, however, are very strict on deadlines and thus faculty need to be properly shepherded into getting their materials in time.