More random thoughts about time:
Jack is the one who wears prominent (wrist)watches.
Jack is the one who says "Never enough time, never enough"
= it's
Jack's time that is running out
.
On Brokeback neither of them wears a watch: on Brokeback, they they onwned the world and all time (a whole summer seems to be a huge, near endless amount of time, especially when you're 19), they believed themselves invisible and nothing seemed wrong. But they were wrong in two of these three assumptions: their time was cut short (by Aguirre) and they weren't invisible (Aguirre watched them). And it is Aguirre, who gives Ennis the watch. F*** Aguirre!
I think Ennis didn't wear the watch because they
seemed and wanted to believe to own all time, they did not count it, they did not (yet) think about the end of summer. But of course the watch was always there, with them, in Ennis's pocket. To deny the existence of the watch could not keep the time from ticking down and summer was cut short.
"Never enough time, never enough." is said by Jack at their very last time together. Their time is over, it ends at this very day. So "never enough time" is an understatement: there's not only too little time, there's no more time at all. But they don't know it
.