How bad? If it's really bad, state of the art says 2 year survival rate. My mom did 52 chemo sessions, got 8 months of good life, 1 year of endless pain and succumbed.
So, like 2 years from date of operation unless some major therapy comes onboard. Of course, as a scientist in this field, we dream of that happening just like it did for AIDS patients.
Just a coincidental footnote. My colleague is now on hospice for bile duct cancer. He got less than a year and nothing they did tamped it down. Generally speaking, no surgeon will touch that cancer. It spreads to any and everything so surgery is pointless.