How often after concrete has been poured do you start watering? I had a new driveway, patio, shed foundation poured and they finished at around 2p. It's sunny and 90 degrees. I asked if I should start watering tonight and they said "no, tomorrow morning and night." Not to discount their experience with concrete, but they spoke very little English so I want to confirm this is good advise.

Curing Concrete Dos and Don'ts - Bob Vila

DO spray new concrete with water.
One of the most common methods for curing concrete is to hose it down frequently with waterfive to 10 times per day, or as often as you canfor the first seven days. Known as "moist curing," this allows the moisture in the concrete to evaporate slowly. Moist-cured concrete can be up to 50 percent stronger than concrete that was cured without being dampened! Spraying is not recommended for concrete poured during cold weather, however; for pours in chilly weather, see "Don't Let Concrete Get Too Cold," below.

DO cover new concrete.
When you don't have time to revisit your concrete with a hose as many times as necessary for true moist curing, another option is to use a cover that can trap and slow the evaporation of the moisture in the mix. Either polyethylene sheeting that's at least 4mm thick or a concrete curing insulating blanketboth available from DIY storesare good for this task. Wet the concrete thoroughly, and then cover it with the sheeting of your choice, using bricks, rocks, or other heavy items to hold it in place. Remove the sheeting or blanket daily, wet the concrete again, re-cover it, and repeat for seven days. This technique can also be used for upright concrete columns and walls by wetting them down and wrapping them with a curing blanket or plastic sheeting.

Thanks. The question is how soon is too soon to start watering?

When To Water Fresh Concrete: Essential Tips For Optimal Curing And Strength - ConcreteCaptain.com

Concrete doesn't "dry" . It is a chemical reaction that needs moisture to complete.

It needs to be moist, not necessarily wet. The harder it gets, the more aggessive you can get. A fine mist at first, but it needs to be hard enough that the water doesn't damage the finish.

Covering with plastic will help retain the moisture, but it will leave patterns on the surface. Don't do it to surfaces that you want to look pretty.