E10A-USB is an on-chip debugger. So such function like time measurement must in the first place be supported by the device. I believe no device supported by E10A-USb does support this, so no such window is available in HEW. You could try to analyse trace data, but I assume that trace buffer size is not big enough to get sufficient data. I would propose to go back to the roots, toggle ports at the points you are interested in and measure the time using an oscilloscope.
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