Here is a goal: How quickly should I grind and polish the concrete when making a concrete countertop?

Which way makes more sense to accomplish this goal?

Available options:
[1]. Do all your grinding and polishing after 4 days but before 10 days so the concrete is stiff enough but not full strength yet;
[2]. Do all your grinding and polishing after 4 days but before 10 days so the concrete is stiff enough but not full wetness yet;
[1].