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.
Best Answer: concrete usually sets up in a day or two depending on the weather. But take several days to actually cure.You should be able to do what you want with it in a day or two.oncrete will 'set' typically the same day. You should stay off at least one day, 7 days for vehicle traffic, and 28 days completes the full curing process.