영어 문장 해석과 of the time 용법 질문

다음 문장을 끊어서 해석해 주실 수 있을까요?
“The participants’ rating on a potential relationship with new friends within a few minutes is the best predictor of how the relationship actually developed over the next nine weeks.”
그리고 “They found that 53 percent of the time, the coin landed on the side that it started from.”에서 of the time은 어떤 의미인가요?