Absolutely no chance if today was anything to go by!
That's the thing: as you get better, the effort expended per metre decreases. Noticeably.
Such that, you may find that something other than fatigue becomes your limiting factor.
For me, it is mostly boredom, lack of time, general discomfort (when it gets below a comfortable temperature, I want to get out because it is no longer enjoyable)...........
.....sometimes, lower back ache, from prolonged front crawl.