record time spent per question in untimed mode

Timed mode shows time spent per question but cuts you off when time is up. I prefer untimed mode, so that I am not cut off, but I would also like to see stats on how long I spent per question. That way I can see which questions I spent the longest on. TrueLearn COMBANK has this feature, and I prefer COMQUEST question bank to it, but it would be nice to have that feature.