Miami Precision Concrete says wait 7 days to park a car on new concrete and 28 days for heavy trucks. Walking is fine after a day or two.
Heavy rain may add days.
Here is why.

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Concrete hardens by hydration. We follow the FHWA pavement curing guidance before saying it is safe.
Concrete driveway edges are weakest, so keep tires off for a month.
The American Concrete Institute sets 7 days of curing, or 70 percent of design strength.
Engineers specify strength at 28 days, when heavy loads are fine.
Heat speeds curing, so drying too fast is the risk.
We pour early, use retarders and keep it moist, still holding 7 days.
Dry-season pours cure steadily. Cool rain adds days.
See why concrete cracks in Miami for curing and cracks.
The apron is where garbage trucks clip first. Keep carts off.
Plan deliveries after day 28. See driveway permits in Miami.
A concrete patio takes feet in a day or two, furniture in a week.
A concrete slab for a shed takes framing in days; vehicles wait. A walkway is ready in a couple of days.
No power washing until full strength.
Small joint cracks in week one are normal.
We set the date around the weather. Call (786) 305-3443.