Got the plugin installed from https://moodle.org/plugins/block_timestat . Based on that it works "experimental" with 2.9.
Updating -> (moodle dir)/lib/outputrenderers.php with -> require_once($CFG->dirroot.'/blocks/timestat/lib/timestatlib.php'); was I little tricky.
What exactly does "experimental" mean?
Planning on a 3.0 version?
I've been wanting to create a lock based on time spent in previous activity, possible with the data you are collecting in timestat?