Hi Antonio,
This question cropped up last Dec 2007, at the time Slav reported back that:

"In fact, the question time (latency) is collected by question (or test) object, but it is not easily accessible from run-time. It is sent to LMS in SCORM 2004 "cmi.interactions" array. But unfortunately, I still don't know any LMS can build reports on these parameters."

So Couselab does make these available but they aren't being picked up. I'd advise checking the Docebo forums to see what is said about this there.