Congratulations @LeaW! What a great place to be, finished!
My old oncologist said there's starting to be sufficient evidence supporting the 7 - 10 year time frame, and they're now looking at the 10 - 15 year range. My new oncologist was leaning more towards the 5 - 7 year period. We'll see! I'm six months in.
As for doing everything you can to keep it away, it's the same old same old. Regular moderate exercise, keep your weight in the normal range and little to no alcohol. It won't outright stop the cancer returning, but it will reduce the chances. And make you the picture of health!
Onwards and upwards! K xox