public ConcurrencyLimitBuilder timeoutMillis(long timeoutMillis) {
        checkArgument(timeoutMillis >= 0, "timeout: %s (expected: >= 0)", timeoutMillis);
        this.timeoutMillis = timeoutMillis;
        return this;
    }
Sets the amount of time until this decorator fails the request if the request was not
delegated to the {@code delegate} before then.
core/src/main/java/com/linecorp/armeria/client/limit/ConcurrencyLimitBuilder.java