There’s no timer. You can tap the little lines at the top but you can also tap the right third of the screen to go to the next note. You can tap the left side of the screen to go back. You can also swipe horizontally left and right to jump between people. Tapping in the middle should open the note details (unless there is a link there). We really need some kind of way to explain it. But we haven’t spent much time on it since the initial experiment of putting it out there. It isn’t getting a lot of usage, but maybe this is why. 

 Oh nice. I didn’t know tapping the left and right would switch notes.
I think the first time I used it I tried swiping and then when swiping switched between people it didn’t seem quite right so I stopped using it. 
For example, I clicked on a person to get there so I guess I assumed swiping wouldn’t switch to a different person once I was in there, if that makes sense.
Cheers to the new feature though!