MaxBuffer length for WCF(30Mb you can return)

<binding name="LargeBuffer" maxBufferSize="2147483647" maxReceivedMessageSize="2147483647">
     <readerQuotas maxDepth="2147483647" maxStringContentLength="2147483647"
      maxArrayLength="2147483647" maxBytesPerRead="2147483647" maxNameTableCharCount="2147483647" />