That depends-asphalt could be a one day project. If it's concrete, they need to come in and remove whatever material that is currently in there unless it's a brand new house. If it's a brand new home you can almost come in there and form it in one day. It just depends on your contractor.
Concrete starts its hydration process the minute it goes into the back of the concrete truck at the plant. Typically, you should be able to walk on concrete without leaving footprints on it. It just depends on what time of the year it is. If I pour concrete in 100 degree weather in the morning, I can walk on it that afternoon without leaving footprints on it. It depends on what time of the year it is. During the winter time when it is much cooler, your set time is going to be slower, but you can put add-mixtures in concrete to accelerate that process. You can add the add-mixture concrete to slow down the process. If you get concrete on your skin, wash it off immediately. Concrete has got lime in it and other natural products and it will burn your flesh. And people who have been burned by concrete will know they have been burned by concrete.
