GitHub Actions test sharding: how many shards actually pay

<p>GitHub Actions test sharding trades money for wall clock, and it stops paying at a point you can calculate from two numbers you already have. On a runner we measured, a 26.8 second suite split two ways finished in 13.8 seconds and four ways in 9.2, while the billed time went the other way, from 26.8 seconds to 27.5 and then 29.0.</p> <p><a href="https://media2.dev.to/dynamic/image/width=800%2Ch

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