Changed default nccl timeout to 600s issue #2703

[jubueche]

What does this PR do?

Fixes #2703

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[muellerzr]

Thanks! Let's be a bit more thorough though please :)

[SunMarc]

+1 with @muellerzr comments. We could potentially add a description for timeout since I feel time timeout is used a lot and now it is kind of complicated since the default value depends on the backend.

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

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[SunMarc]

Closing this PR since the PR above fixes the issue !