Test question: How would you say "I haven't been in France for long."?
Per the lesson, Ne...pas + Présent indicatif + depuis longtemps = not long / not for long -> It started a short while ago, and is still ongoing
My answer marked incorrect: Je n'arrive pas en France depuis longtemps.
Correct answer per system: Je ne suis pas arrivé en France depuis longtemps.
According to the lesson,
use of Présent indicatif translates as "not long / not for a long time," whereas
use of Passé composé translates as "not for a long time / not for ages; over and done in the past"