Can you sense an hour?
yes you can
can you sense a min?
yes you can
so you can sense two seconds
and so One second
can you sense 1/10th of a sec
yes by the same feeling
and 1/1000th?
yes I should be

hmmm so my question is what is the smallest time you cannot really sense
meaning you wont be feeling a wait?

you cannot imagine that..but you can imagine that you will sense time always
mathematically you can divide time and make smaller and smaller always as much as you like

so there has to be always an interval, however small
and an interval brings the idea of a distance..a space between two points in time

so in order for you to feel instantaneity, or no time interval, this space must be zero

now, that's inconceivable, but according to Einstein that's what happens to "light"

if you are "light" then you will not feel this interval or distance

you will be eternity