I had a 4" thick concrete slab poured yesterday (C30 mix) for my 24m2 garden cabin. It was hot and I probably got a tarpaulin on it a little late in the day before it starting to set. There is a very small crack on one side less than a mm wide and runs a few feet. There are no other cracks so I'm not overly concerned. The cabin build will be timber so all the weight will be on the outer edges where I bevelled the compacted scalpings to give me a deeper level of concrete. It's hot today and will be over the next few days so just wanted some advice on managing the curing process when the sun's out. I've sprayed a light mist of water on it this morning and re covered it but I'm unsure how often I should do this. Is once a day good enough or should I do this twice a day until the sun and heat isn't as bad? Also I've read it's worth keeping it covered for up to 7 days. Does this sound about right?