RFR: 8260555: Change the default TIMEOUT_FACTOR from 4 to 1 [v4]

[David Holmes]

On Wed, 20 Aug 2025 15:21:39 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> I realize that this is highly hardware dependent, but test times tend to be Pareto distributed, so a very quick test maybe takes 1 second on fast machines and 10 on slow, 

@magicus unfortunately that is often not the case in practice. We can see many tests that normally run very quickly but occasionally run very slow - minutes versus seconds.

> Right now it seems engineers is spending their valuable time giving guesstimates for each individual test. That seems like poorly used time and resources.

For this exercise existing explicit timeout values need to be multiplied by 4 to keep the same absolute timeout value. In addition a number of tests that use the implicit default timeout (120*4) now need an explicit timeout (480 generally).

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PR Comment: https://git.openjdk.org/jdk/pull/26749#issuecomment-3208143195