I think it's less a case of time spent, as a case of being ready to answer the likely questions!
Does your institution offer Viva prep training? We had a handout given that listed likely questions and I used that to prep. It was similar material to the viva prep books that you will find in your uni library. So for example:
Why did you do a PhD?
Why this PhD?
What would you do differently?
Why this methodology?
What are the implications of your findings?
What's changed in the field?
What next?
So refreshing your memory on why you made decisions at each stage. You have time in the viva to flick through the thesis, so it isn't a memory test of what you wrote. Be ready to answer questions on what and why, including if you would do things differently in hindsight.
It really depends on how well you know your thesis inside out. A friend had to have an emergency viva - she didn't expect to have it that early and later she was told that she would have it in 5 days time as they were racing time for her to graduate in December. So she only revised her thesis for 4 days. Eventually she passed with minor corrections.
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