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//0x8 bytes (sizeof)
union _ENERGY_STATE_DURATION
{
    ULONGLONG Value;                                                        //0x0
    struct
    {
        ULONG LastChangeTime;                                               //0x0
    ULONG Duration:31;                                                      //0x4
    };
    ULONG IsInState:1;                                                      //0x4
};