Explanation

"It has been a long time since we met last?"

"آخری ملاقات ہوئے کافی عرصہ ہو گیا ہے؟"

Additional Information:

In this sentence, we use the conjunction "since" to indicate the time that has passed since the last meeting took place.

The verb "met" is in the simple past tense, which is used to describe completed actions in the past.