Once you’ve painted the concrete, you need to wait until it is fully dry before walking over it or placing things on top of it. On average, the first coating of paint will take around 12 hours to fully dry, during which time it should be left to dry undisturbed.
If you’re adding extra coatings of paint, they might take the same amount of time, or slightly less, and they should also be left to dry undisturbed.
And to finish off the paint job, you will usually use a top coating or sealing layer, and it’s important to check the information as each will take a different amount of time to dry, on average.
But on top of this, if you want to avoid the risk of scratching the newly painted concrete surface, you should wait around 7 days before walking over it with shoes or placing furniture on it.