I checked the crontab of a default install for the latest image they're serving from their website. I can confirm that runs the owner's donation script for 15 minutes at 3 AM.

This is the script that runs:

#!/bin/sh
export GPU_MAX_ALLOC_PERCENT=100
export GPU_USE_SYNC_OBJECTS=1
sleep 10s
mine stop
sleep 10s
screen -d -m -S cgminer /opt/miners/cgminer/cgminer -c /home/.donate.conf
sleep 15m
clear
sleep 10s
killall cgminer
sleep 10s
mine start
sleep 10