Construction update. Rapid progress all week

It's Friday morning. Religious day, and the quietest day of the week. The day all the construction workers have off, EXCEPT right outside my apartment.
Work on the construction site has been very busy and active this week. Last Saturday they had built the foundations up to ground level, leaving a honeycomb, small square tank like areas exposed.
On Sunday - Tuesday the front end loaders were back and proceeded to fill each of the squares with sand. And what sand didn't go into the square tanks, definitely floated across the road way into our apartment block. We have had a reasonably strong wind blowing for 3 days. (As an aside, strong enough for the authorities to cancel the Al Ain Airshow for those 3 days, but not a strong NWer as we would know it)

On Tuesday afternoon the concrete trucks were back, sealing the tops of the tank like structures with concrete. One briefly thinks of all movies one has watched and all the sins and unknowns that are being buried and sealed off below! We're back to an even playing field now, so to speak. The structure is at ground level.

Suddenly on Wednesday all these tower type structures were built, and early Thursday morning the concrete trucks were back filling the towers.
Bright and early this morning, at 6:00 am when its not properly light, the little workers are removing the boxing. The rest of us are removing ourselves from bed. the neighbourhood can't sleep woth that commotion going on outside

With my limited building experience I would have thought the concrete needed more than 24 hours to go off and therefore the boxing stays in place longer. I have vivid memories of keeping the concrete wet so it sets slowly. On this site the boxing is removed exactly 24 hours after the pour. Temperature wise it's around the mid to late 20's each day now. You definitely notice its beginning to get warmer, so why is this fresh concrete being left exposed. In the heat would it swell inside the boxing, would it sweat? My thinking is that if the concrete is left exposed quickly and not given an appropriate time to set, exactly how stable are the foundations and structures of our buildings?