VB6 Get Idle Time of system

I'm trying to determine the idle time of the system.  I was trying to use this code:

Private Type LastInputInfoType
    Size As Long    'Bytes
    Time As Long    'Dword
End Type

Private Declare Function GetTickCount Lib "kernel32" () As Long
Private Declare Function GetLastInputInfo Lib "user32" (plii As Any) As Long

Public Function IdleTime() As Long
    Dim LastInputInfo As LastInputInfoType
    
    LastInputInfo.Size = Len(LastInputInfo)
    GetLastInputInfo LastInputInfo
    
    IdleTime = GetTickCount - LastInputInfo.Time / 1000
    MainForm.Debug1Text = GetTickCount
    MainForm.Debug2Text = IdleTime
    MainForm.DebugText = "Time: " & LastInputInfo.Time & vbCrLf & "Size: " & LastInputInfo.Size
    
End Function

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But it's not working.  When I put the variables in a text box to see what's going on, I'm getting numbers in the billions for both with the LastInputInfo.Time about 15-16 (varying) less than the GetTickCount value.  If I'm reading this, LastInputInfo.Time should be static UNLESS I'm using things... but it's always sensing activity and I'm not sure why...

I'm using a timer control to check every 100 ms - IdleTime is requested every timer cycle.

I'm open to other methods if anyone has them to detect idle time...