It depends on the temperature and humidity of your area and it depends on how much moisture is in the concrete mix, how thick the slab is, and other factors too. Those can have a big effect on how fast your concrete sets up.
If it is in place by 11, you ought to be OK by 8pm like Allan says. But if they just get there by 11 and don't get it poured until later in the afternoon, it could get dicey.
I've put in concrete that we had to bust our butts to get a finish on before it set up, and I've had some that we sat around for hours waiting for it to "go". You never know.
If it was me, I'd have some plastic available to throw over it, especially if you expect a hard, driving rain. Better to have it and not need it than to need it and not have it.
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