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.
Third the required cure time for concrete is a minimum 7 days to apply load to the foundation walls as well as foundation (footings) unless using a high early strength concrete.Final cure date is 28 days from placement date, which is considered the adequate duration of curing by the American Concrete Institute.hird the required cure time for concrete is a minimum 7 days to apply load to the foundation walls as well as foundation (footings) unless using a high early strength concrete.