Ask HN: How much progress do YC companies make in 3 months?

Sam Altman tweeted: "it's amazing how much a team can accomplish in 3 months with a little money and no distractions"

This got me thinking.

How much progress do YC companies make during their 3 months?

What is the mean/median progress for product development? How much product development does the best in a batch make?

Same question about mean, median and max for business progress? How much revenue? How many customers? etc.

The best approximation that I've found is:

week #2: 1st prototype

week 7/8: Start selling

week 10: Prototype Day and start prepping presentation for Demo Day

Week 12: Demo Day