When you say "i want to get", do you mean that given from an external source Queue5 and Queue3-WFR, you wish to calculate the time difference, or is there some other way to determine which queus are involved?

How big are the files? Do you need to search the whole lot to answer a question, or is the question only about the contents of a single file?

What does the code look like that you are using at present to parse the files?