Sharing my experience.

My viva lasted for 1 hour and 30 minutes. I was lucky I had very nice examiners.
One of my examiners didn't even bother to show up during my viva because he had other things to attend to.

10 minutes introduction from viva committee
20 minutes presentation
40 minutes Q & A
10 minutes post viva session where we took photos together

Don't worry much if you already published scientific papers into reputable journals
In my case, I already had 3 Q1 publications during my PhD years so my examiners went easy on me