Well, my husband was given a year, and that started when he got his doagnosis. I was concerned at first that the doctor was refering to a year from when he got sick, but they said no, it's from formal diagnosis.
Also realize that these time frames mean nothing to YOU as an individual. Some people react well to treatment, others not. Those are averages. One friend went from Stage 4 to remission in 6 weeks. Another went from Stage 2 to Stage 4 in a month. Just depends on the individual and how the body responds.
My family is learning.... one day at a time... enjoy the time you have... make the most of each day.