Constant FETCH_TIMEOUT_GRACE 

pub const FETCH_TIMEOUT_GRACE: Duration;

Grace period for a network operation that times out or is cancelled: on Unix processkit sends its graceful terminate signal and waits this long before hard-killing. On Windows the grace window is useful only when a child has a soft trigger: the shared apply_fetch_completion_policy opts console children into CTRL_BREAK, and processkit also tries WM_CLOSE for windowed children. A child without a shared console, including one started with create_no_window or DETACHED_PROCESS, skips the soft trigger and falls back to the atomic job kill. The cancellation outcome is still ErrorReason::Cancelled. The policy only takes effect when the relevant timeout or default_cancel_on token is set; a network operation with neither is unaffected.