A question rather than an update: Doing it at work in a locked room
Squeamish subject, so I am going to be plain about it and get it over with.
What I would find most useful is not advice. It is somebody describing what their version of this was, and how long it went on for.
I have written down what has actually happened, in order, because I find that more useful than my summary of it.
I will report back either way, because I have been helped by other people's follow-ups more than by their questions.
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