function getListSize() {
	const MINIMUM_SIZE = 10;

	if (typeof process.env.TIMING !== "string") {
		return MINIMUM_SIZE;
	}

	if (process.env.TIMING.toLowerCase() === "all") {
		return Number.POSITIVE_INFINITY;
	}

	const TIMING_ENV_VAR_AS_INTEGER = Number.parseInt(process.env.TIMING, 10);

	return TIMING_ENV_VAR_AS_INTEGER > 10
		? TIMING_ENV_VAR_AS_INTEGER
		: MINIMUM_SIZE;
}
Decide how many rules to show in the output list.
@returns {number} the number of rules to show