Concrete is fully cured and has reached its full Compressive strength at 28 days, period.
After 3 days normal foot traffic may resume but avoid dragging heavy items.
We request that you not drive on the new concrete for 7 days.
Sometimes people dont want to wait long and drive on the concrete placed 3 days before. It can be done with small cars and light trucks but it should be wait for 7 days. The full 28 days for heavy equipment or large heavy trucks.