I have just seen mine do the same. I praise the feature but this is stupid. It will not go off no matter what time I schedule it for. Right now it is from 22.40 to 09.45 but it will not turn off. When I switched the time it was the same. I did not have the problem yesterday like many others. It started today. Now I have to manually switch it on/off
iOS 6: Do Not Disturb mode stays on after scheduled time
iPad, iPhone, iPod touch
After January 1st, 2013, Do Not Disturb mode stays on past its scheduled end time.
Do Not Disturb scheduling feature will resume normal functionality after January 7, 2013. Before this date, you should manually turn the Do Not Disturb feature on or off.
To turn off the scheduling feature, tap Settings > Notifications > Do Not Disturb and switch Scheduled to Off.
This document will be updated as more information becomes available.
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From Apple knowledge base