public void setDefaultRequestTimeout(Duration defaultRequestTimeout) {
        this.defaultRequestTimeout = defaultRequestTimeout;
    }
Set the default request timeout duration for new calls (on a per call basis). By default and if zero value is
configured, the timeout will not be used. The default request timeout will be ignored, if a deadline has been
applied manually.

@param defaultRequestTimeout the default request timeout or null.

@see CallOptions#withDeadlineAfter(long, TimeUnit)
grpc-client-spring-boot-starter/src/main/java/net/devh/boot/grpc/client/config/GrpcChannelProperties.java