Twitch: What really is time? If time is the dimension of duration, it is durable dur=tough, perhaps that why it always was, eternal, before the Big bang?
Twitch: what is an instant? in our movement through time, the now, at any instant is of zero length, that is why time is so precious, it comes in such small quantities for us. Our brains have so much inertia in their function, that time is sensed in us in increments, like brain waves. Could we one day measure a "Plank" duration, the smallest distance possible to move through time, the true instant? Such discovery would be relevant when we explore the cause of the big bang, surely. just putting these ideas out there.