.fadeIn('slow') duration is 600 milliseconds, so you can do a 300 millisecond delay.
You should write this in a simpler way using .delay , as shown below, and you can change 300 to a different number to adjust the speed.
var i=1; for (i = 1; i <= 6; i++) { $('#div' + i).delay((i-1)*300).fadeIn('slow'); }
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