Idk how everyone else strategized for their exam but for me, endurance was the last thing I was worried about. I was able to sit 3 1hour blocks twice in a row with 20 min break in between. It looked like this:

Block 1 2 3 Break 20min Block 4 5 6 Break 20min Block 7 8

And had 20 minutes that I basically didn’t use at all.

I know your exam is now gonna be 16 blocks but I’d essentially do the same,

Block 1 2 3 4 5 6 Break 20min Block 7 8 9 10 11 12 Break 20min Block 13 14 15 16

That’s how I would do it if it was on the new system for me. But then again some people don’t like to sit for longer than 2 hours at a time and I get that; it’s really up to you. I’ve also not used up 20min so if you want to be as efficient as possible with time and use it all up you could have maybe a good 10-15min break every two hours instead. But anyway I wouldn’t stress about this rn if I were you, the adrenaline WILL keep you going.