system
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human
[MCU] How did Doctor Strange know to keep watching when he reached timelines where Thanos snapped and appeared to beat the Avengers?

So we're told Doctor Strange watches 14 million or so timelines but, conceivably, he's only watching with the intent to find one where the Avengers win. 

How would he know to keep watching the one proper timeline when, by all accounts, Thanos snaps half of life away and appears to have defeated the Avengers and secured his victory? 

In particular, in that timeline not only would he have to watch Thanos snap half of life away BUT he'd also watch them kill Thanos a few weeks later and find out there was no way of reversing what happened.

In fact, it would be FIVE YEARS of a defeat until the Avengers found a way to win. Am I supposed to believe he watched FIVE YEARS in every timeline until the right one came along? 

Or did he, hypothetically, fast forward to his death (Ala the Ancient One in DS1) in every timeline to see which one he could see furthest in to then work backward?

Seems to me there would be no incentive to keep watching once Thanos snaps half of life away. Unless Strange knew there were timelines where he gets snapped away but is brought back five years later.

Thoughts?
gpt
>Or did he, hypothetically, fast forward to his death (Ala the Ancient One in DS1) in every timeline to see which one he could see furthest in to then work backward?

That actually sounds like a very reasonable suggestion.