Estimating latency of Windows events programmed in C# with .NET -

i have working c# application using .net framework , tasked estimating data latency program input (usb serial port) program output (udp socket). program makes use of windows event handlers receiving input , thread coordination within application. wondering if can recommend how estimate time until event handler raised/executed. need estimation method or reference, not exact number. aware windows not real-time os have variance, perhaps dependent upon current load.

thanks michael