What's a reasonable time to wait for seed to sprout?

Hiya Folks, I planted three germinated seeds on Saturday, two sprouted within 48 hours. No sign of number 3 yet. What's a reasonable time to allow her to sprout, before I pop a replacement?
So the 3rd is 24 or so hours behind the first 2 right now?
 
I will wait five days max.
I just had a couple seeds take 9 and 10 days to sprout. But I place mine directly in soil. No soaking or anything. If they had a tap and the first 2 popped up in 48 I’d say wait til Thursday or Friday and if nothing dig it up and drop a new one. If you don’t dig it up I can almost guarantee you’ll have 2 sprouts eventually.
 
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