Do I have any obligations to my PhD supervisor's requests after I have graduated? I graduated with a biology PhD last year. My supervisor named X was pretty hands-off (which was great) and most of my project, from conceptualization to data analysis, was done by me generally without much input from X partly because it wasn't X's area of expertise. I now have a full-time job doing math. X insists I meet with X to discuss how to turn a manuscript (rejected last year as I was writing my thesis because it required significant revisions and additional experiments) into publishable form for resubmission for grant money purposes, and then work on that on my own time. 

So I was just wondering whether I have any obligation, professional/moral/official/other, to comply with X's request (other than my personal responsibility to publish stuff I've done and not waste time/resources I've used), because X is not going to be paying me to spend my free time working on this manuscript and this manuscript isn't going to help me with my career.  

Approximate time to get this into publishable form is: 2-3 months working weekends by me to do additional analysis from existing data, and 6-12 months for additional experiments done by a person in X's lab who will require training from me. 

To clarify, 


My new job is not in academia, but I do regularly write academic math/stats papers as a part of my job.
I am thoroughly disillusioned with academia and never intend to return.
The intent is to publish a paper that X can cite in grant proposals to show productivity etc.
I think it's reasonable for X to ask, but you have no obligation to say "yes". In particular, 2-3 months of weekends is a lot of time to work for free. I think that if you choose, it would be reasonable for you to politely say that this is too much, and that he needs to get somebody else to do that analysis. If this is work that you have already done a lot of, you should still be an author on the resulting paper.

If your new job is with a university, then it is worth asking your new supervisor if you can spend some time on it. They may be happy that they can get a paper with their affiliation for only a couple of weeks of work. If your new job is a commercial one, this is much less likely to help.