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Only if it's material to the company.

Although some are filing proactively to say that they're not exposed.[1]

seems with such a public and large failure that it's not unreasonable to say that not being affected is material information as well.

How long do they have to file the 8-k? I own stock in a few high tech very silicon valley based companies that aren’t mega tech. A little concerned.

form 8-k itself seems to say 4 days or less: https://www.sec.gov/about/forms/form8-k.pdf

Great, so we can expect to see a flurry of 8-ks come Monday. In the wise words of South Park. “Anddddddddd… It’s gone!”

And miss the opportunity for a Friday night filing outside the news cycle?

well four business days, so Thursday or whatever, but yea