gistfile1.txt

const p = 0.9;
const np = 1 - p;
const newCards = 15;
const ease = 2.5;
const max = 1200;
const secondsPerCard = 6;

const queue = [{baseDays: 5, factor: 1}];
let total = 0;
while (queue.length > 0) {
	const {baseDays, factor} = queue.shift();
	if (baseDays > max || factor < 0.0001) {
		continue;
	}
	total += factor;
	queue.push({baseDays: baseDays * ease, factor: factor * p}, {baseDays: Math.max(5, baseDays / ease), factor: factor * np});
}

const totalCards = total * newCards;
console.log(`Total cards to review: ${totalCards}. Review time: ${totalCards * secondsPerCard / 60}`);