Bill G. (excuse the intrusion on an interesting conflab), I go along with what you say there except that, for me, one thing is reversed: I have a satisfactory workaday concept of 'time', and I find it easy to envisage, and natural, that it should go on, and on...and on; but I can't conceive of an end of time. Likewise, I find it easy to accept space without end, and impossible to grasp the concept of an end to space. In my mind, there always has to be more space beyond the horizon. I mention that simply to point out that the concepts we think we can grasp are evidently not the same for all.

"Time is what prevents everything from happening at once" - John Wheeler