Bonjour Jerry, if you listen really carefully , you should be able to hear the "t" in "Partent" being pronounced [part] this indicates it is plural.
If it were singular "Il" the pronunciation would be more like "Par".
It has taken me a LOoooong time on Duo to figure this one out! ;]
If the first "t" in "partent" is not pronounced at turtle speed then that is an error. Report it.
It should sound pretty much like the English word "part", whereas "il part" should sound much like the English word "par".
In this particular sentence you can hear the "e" of "partent", which you should not hear at turtle speed.
Possibly because it is too difficult to figure out what it is trying to say because the word order is illogical.
Are they leaving around something called "what time"?
Are they leaving behind something called "around what time"?
What the heck is the Object of this sentence?