An Extra Day
If you had an extra day to get ready for your viva, what would you do?
Would you spend a chunk of time reading your thesis again, just in case you missed something?
Perhaps you’d feel better if you sat down and talked with your supervisor some more.
Or you could consider gathering stationery and going over your thesis pages one more time just in case you can add something helpful.
One more day is a lot of time and you could complete a lot of helpful work – but given everything else you’ve done during your PhD and after submission, maybe you could just take the extra day as a chance to rest?