The additive I like to use has these properties:

Zinc: 4898 ppm (4700ppm)
Phosphorus: 4921 ppm (4300ppm)
Calcium: 4279 ppm (7800ppm)

Unfortunately it isn't available any longer over the counter, I'm relying on a stash.... but there are plenty of good ones out there.

Their direction to go for 10 minutes, cool down and another 10 minutes is good.
My last one (a mopar performance hydraulic, everyone's favorite!)
I did between 5 and 7 minute intervals, and did it like 5 or 6 times. As long as you eventually get to the 20+ to 30 minute mark
and keep enough rpm in it for splash and decent lifter rotation you're good. There's a little less stress doing it in smaller time increments.

Oil grade and brand....might as well be politics or religion......
I feel the most confident with sae 30 or 40 single grade but
only because that is all I ever used since my first build, not because I'm a lubrication engineer.

Remember the low end of the multiple viscosity scale (typically 0w, 5w and 10w) is a rating based on viscosity at freezing temperature.
If...during your break in....your ambient temp will be, for instance, 75 degrees, I guarantee the oil will not
be flowing as a 5w or 10W would. It will be somewhere between the low and high end of the scale.

Verify your lifter rotation and oil flow to all the parts before the intake is bolted on....good luck