My viva was four hours long. It was over in an eye-blink. I left my viva thinking, “What just happened?” I was tired because I had slept badly, and the viva was quite an involved discussion at times. Still, I was really surprised to find out four hours had gone by. I’ve heard similar stories from other PhD graduates: vivas that seemed to take no time at all despite clocks and watches clearly showing hours have passed.
Two/three/four hours at the end of years of research, learning and development – by comparison it really is an eye-blink. In the moment it could fly by, or there could be questions that drag on and on (I remember those too). But relative to all that you’ve done the viva is a tiny step in the PhD process: one of the final ones, but one at the end of a great deal of work by you. However long the viva is, you’re in a good place to meet the challenge.