The specification states in part 20 to TemporaryFileTransferType:
"The Property ClientProcessingTimeout defines the maximum time in milliseconds the Server accepts between Method calls necessary to complete a file read transfer or a file write transfer transaction. This includes the Method calls to read or write the file content from the virtual temporary FileType Object. If the Client exceeds the timeout between Method calls, the Server may close the file and cancel the corresponding transfer transaction. Any open temporary transfer file shall be deleted if the Session used to create the file is no longer valid."

But it is not mentioned how the value 0 is interpreted. It could mean "infinite" or "0 miliseconds".