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Note: I assume you actually mean message latency, not packet latency. At least for TCPROS, there is no (guaranteed) correspondence between packets and messages.
If you are really interested in packet latency, you could a tool like Wireshark, which is well supported on multiple platforms, including Windows.
In general I agree with @ahendrix: interpreting these nrs will take some insight into the various parts of the ROS messaging pipeline.
I'd like to add though that there is at least some infrastructure that would seem to support what you are after though: Topic Statistics (added somewhere last year), with rosprofiler and the support for them in rqt_graph.
I must say that I don't know how well this is supported on Windows however.
As it is based on recent Indigo and Jade releases, you could see whether ros_cygwin includes support for it.
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