There is no answers if you don't specify tons of parameters, like the number of element, prior memory fragmentation, etc. 200x can be a reasonable outcome. So

There is no answers if you don't specify tons of parameters, like the number of element, prior memory fragmentation, etc. 200x can be a reasonable outcome. So can be 3x in other conditions. As a rule of thumb I now consider that a completely random memory access is on the order of accessing 1000 sequential bytes.