Hi Matthew,
I don't think we have anything in standard Moodle for tracking time, however you may well find an additional plugin to suit your needs. For example, I took a quick look in the Moodle plugins directory and came across https://moodle.org/plugins/block_timestat.
If you'd like to discuss time tracking further, I suggest you try posting in one of the forums in Moodle in English, maybe General help.