翻译：我在大学期间与几个同学建立了长久的友谊。(long-lasting)

I established long-lasting friendship with several/a few classmates during my college years.

绝对没问题:)

I have long lasting relationship with several of my classmates during the college years.

I built up long-lasting comity with a few classmates during the period of university

I have developed a long-term, lasting friendship with several / a few students in my college.