Concrete takes 28 days to cure. The most commonly used cur promotor is calcium chloride. It should be slick, but it is corrosive, so I wouldn't use it near pipes.
General rules for concrete: - you can walk on it in ~4h - you can drive on in 24h, but I wouldn't go anywhere near edges or corners. - it's very brittle for about a week. - cured enough for drilling and fastening in about 2 weeks, this is ~80% of cure strength - fully cured in 4 weeks.