Visits Time-of-day Histogram for last week in Google Analytics

You can do this easily with

Customisation > Custom Reports > New custom report

Then choose Dimension = Hour. This gives the desired result:

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Note: this seems to be the hour-of-day in your timezone (Analytics account owner), and not the hours from the perspective of the different visitors around the world.

The latter is a different problem that I’m precisely searching a solution in Hour of day of a pageview/event/purchase, but in the visitor’s timezone?.