In 2014 Randall Munroe estimated that Google stores 10 exabytes of data across all of its operations. See list of SI prefixes. If CPUs are topping out at gigahertz then single operations aren’t going to subceed the order of nanoseconds.

                        1 000  kilo | milli .001
                    1 000 000  mega | micro .000 001
                1 000 000 000  giga | nano  .000 000 001
            1 000 000 000 000  tera | pico  .000 000 000 001
        1 000 000 000 000 000  peta | femto .000 000 000 000 001
    1 000 000 000 000 000 000   exa | atto  .000 000 000 000 000 001
1 000 000 000 000 000 000 000 zetta | zepto .000 000 000 000 000 000 001

You might find it easier to think of them in multiples of 1000. And you may be tempted to use binary prefixes to be precise (kibi, mebi, gibi) but most people won’t know what you’re talking about. Also, everybody uses 1000^3 rather than 2^20 because it makes your performance look better.

1000^ 1000^
kilo 1 milli -1
mega 2 micro -2
giga 3 nano -3
tera 4 pico -4
peta 5 femto -5
exa 6 atto -6
zetta 7 zepto -7

References