If I google about screed it is said everywhere that I can walk on it after 24-48 hours. My builder said I can walk after 1-2 weeks only, and they may even place some boards on it to spread the load. I've got screed done 12 days ago and it still looks pretty wet. I don't really understand how could it be that the screed (which is essentially sand and cement mix) could take that much to set? I know that to fully set it takes a month roughly, but usually it is quite solid in a couple of days. Is my case normal? Has anyone heard of screeds that take 1-2 weeks to start walking on?