When Rolling Clock say I have 1.7 years left, Does that mean I have: 1 year and 7 months or 1 year and 8.4 month?

When Rolling Clock say I have 1.7 years left, Does that means:

1) I have one year and 7 months left

2) I have one year and 8.4 months left ( 1.7 X 12 = 20.4 months)