Hi southyard,
I sent you a PM but I will also post the information here.
Depending on how much kidney function the patient has helps determine the life expectancy. If it is below 10% and requiring dialysis, it can be 3 days to 3 weeks.
There is a discussion here that says 1 to 2 weeks
http://www.lifeoptions.org/forums/patient/posts/70.htmlHospice can also give you an idea.
http://www.kidneyeol.org/hospice.htm