How long 120mg. well, the half-life of methadone can be up to 59-hours, so after 2 and half days you would still have 60mg's in your system. But this doesn't take into account multiple doses.
A third type of lock is a security lock. This lock is like a typical password, to prevent someone other than the owner from using the phone. If activated accidentally, the user manual or carrier customer service can usually tell you the default code.
The Personal Unblocking Code (PUK code) is a security feature to protect the SIM card user in case of phone theft. When an unknown user attempts to unlock your phone by putting the wrong PIN code three consecutive times, the card will get blocked.