Congratulations!
You are now under my control!
You're may stroke as long as you want, as long as you're locked in your device and as long as you won't cum (I hope you've got a device in which cumming is not possible, like one with spikes *giggle*).
As it's the testround, you are also allowed to stroke yourself in your hygiene opening and you may also edge, but make sure that you're not cumming!
But Boys: Keep in mind stroking while out of the cage may not be the best idea as you need to fit into the cage by the end of your 15 minutes ;)
Girls: There is absolutely no chance that you may insert something into your honeypot until your lockup-time is expired - there's only clitoral stimulation allowed (remember the no-cumming-rule)!