Howe much postage to send a postcard from US to Canada? As of September 2014, it costs $1.15 to ship a post card  internationally. If it exceeds 4 3/4 inches high or 9 1/4 inches  long, you will be charged the First Class Mail In â¦ ternational price. + 3 others found this useful.
Concrete is never truly done curing, but the minimum wait time should be 28 days. A slab typically cures at least 80% during that time. I suspect the manufacturer is asking you to proceed cautiously to avoid a lawsuit. If you (or your client) can wait that long, then wait the 120 (or more) days. But I wouldn't put any flooring on it inside a month.
What you describe as concrete is actually mortar. Sand and cement combine to mix mortar. (used ro setting bricks, for example) Sand and cement and an aggregate (small rocks) combine to make concrete. Any cementatious product reaches full cure in 29 days.Full cure being structurally safe, for example, that is when a tilt-up concrete wall can savely be lifted into place.oncrete cures essentially forever, although after 29 days, the rate of cure is dramatically reduced. For around home use, you are wondering how soon can you get onto the next phase of the project-whatever that project may be. It does depend on the project as to whether you will be safe or not.