Take the sentence below:
A bike has been in our family for 9 years. My dad used (1) it for the first five, and I have used (2) it for the last four years.
While that was correct, I initially wrote (1) as "has used". I justified it by thinking that the father stopped using the bike 4 years ago. Up until the point where the statement is made, 4 years later, the dad has just used it for five years. The duration hasn't increased since he completely stopped.
Can I interpret it that way?