password or so locking after 6 hours?

hi is there anyway to lock my blackberry with a password or so after 6 or so hours... and after a reboot

I hate the one hour maximum... it's just too short... I just want there to be some precaution if I lose it... but I do not want to keep unlocking it all day long...

must be some app
or some hack...

please help ...


thank you...

No app, or hack that could do it.

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