def METHOD_NAME(self):
    if self.timesOn and self.timesOff and not self.isLookedIn:
        # If not looked at, subtract most recent time from last time on
        return self.timesOff[-1] - self.timesOn[-1]
    elif len(self.timesOn) > 1 and len(self.timesOff) > 1:
        # If looked at, return previous look time
        return self.timesOff[-2] - self.timesOn[-2]
    else:
        # Otherwise, assume 0
        return 0