I don’t remember a lot of the day-to-day life of my pure maths PhD now. I remember little sparks, breakthroughs, and the feeling of being “in the zone” while trying to figure something out.
I also remember, as my PhD went on, the growing feeling that there was always more I could do.
There were more ways to apply the ideas I had developed.
There were more papers to read to find more methods for exploring my field.
There were more questions to ask, and more answers to be found – more to explore.
Even though of course there was a limit to how much I could accomplish throughout my PhD, there would always be more things I could do. And in preparation for my viva, while I invested a lot of time, I could have done even more. I could have spent thirty minutes more each day, an extra day of reading papers or an afternoon checking over the details of a chapter.
I think this generalises further: even with time pressures, life pressures and so on, candidates have to recognise that there will be more things they could explore or do than they have done; however much time they spend getting ready there will be more that they could do which would help them.
And we all have to take a deep breath at some point and say “No. This is enough.” You have to find a way to do that for your research and your thesis. For your viva prep, making a list in advance of what needs to be done could be helpful. Break down what will be enough for getting ready, then work towards it.
There is always going to be more, and there also has to be enough.