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.
Report Abuse. On average, it takes 24-48 hours (depending on weather and how liquid the concrete was when poured) for the concrete to set so you can walk on it or place your shed. It does, however, take concrete up to 5 years to fully cure (completly dry).alk on it a few hours.Build on it depends on the weight of the building materials concrete blocks 5 to 6 days to avoid cracking. Standard frame construction 2 to 3 days unless your going to attach the plate with expanding sleeve bolts then same as first answer.