Consciousness as we know it is associated with a certain definite time-scale. All sorts of physiological matters of fact determine human scale, and within that there is a range at which attention can function, which takes into account the time taken for distinct events to register, the time between intention and act, the speed of thought and so on. If events arise on the empty screen of consciousness then the latter certainly has something like an ISO rating, a seemingly absurd consequence of such an intuition. It is possible to imagine a different consciousness that operates with a time-base either wildly faster or immensely slower than your own, but since it is well nigh impossible to imagine mutual recognition between two subjects at vastly different intrinsic speeds, let alone communication between them, this puts the whole idea in doubt. All of this goes to the question of whether there is any such 'thing' in the world as a consciousness, as would seem to be required by physicalism, even, and perhaps a fortiori, if it understood to be epiphenomenal or emergent. If consciousness can only exist in a narrow band of absolute scale this too raises interesting questions, and strengthens the case for its essentially social nature, that it doesn't just happen but requires some sort of internally mutual recognition.