Less than 6 months
Unfortunately, pancreatic cancer
is diagnosed late in most people - when it has already spread within the abdomen or to the liver. The average life span for that is less than 6 months, maybe a little better (but not much) with chemo.
If the tumor can be removed surgically, the average life span then is over a year, but a small percent can be cured with a combination of surgery , chemo, radiation.