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filter is not described

http_request_timeout filter-hook . WP 2.7.0

Filters the timeout value for an HTTP request.

Usage

add_filter( 'http_request_timeout', 'filter_function_name_391' );
function filter_function_name_391( $timeout_value ){
	// filter...

	return $timeout_value;
}
$timeout_value(int)
Time in seconds until a request times out.
Default: 5

Where the hook is called

WP_Http::request()
wp-includes/class-http.php 158
'timeout' => apply_filters( 'http_request_timeout', 5 ),

Where the hook is used (in WP core)

wp-admin/includes/class-wp-importer.php 201
add_filter( 'http_request_timeout', array( $this, 'bump_request_timeout' ) );