Patty

It depends how fast you chug them.

I shake up my yellow red bull and then shotgun 'em.

1 will give me a bigger energy boost if it's shotgunned

2 will continue that boost for like 3 hours and then a smaller boost than it ignores fatigue for like 6 hours

I suspect you would have a 10 hour piss

Why not 10 hour energy and double the energy for 5 hours? Think about bioavailable half-lifes. But in reality, your caffeine reaction isn't linear.