If $10^9$ electrons move out of a body to another body every second, how much time is required to get a total charge of 1 C on the other body?

NCERT  Example 1.1 If $10^9$ electrons move out of a body to another body every second, how much time is required to get a total charge of 1 C on the other body? 

\[q = Ne\] But here time is involved, so 

\[Total\; Positive\;Charge = \frac{Electrons\; removed}{sec} \times time \times Charge\; of\;electron\]

\[1 \;C = 10^9 \times time \times 1.6\times 10^{-19} C\]

\[time = 6.25 \times 10^9 sec\]

\[=\frac{6.25 \times 10^9 sec}{365\times 24 \times 3600\; sec}\]

\[\approx 198 \; years\]

This tells us that 1 C is a huge amount of charge. Often we deal with $mC, \mu C, nC $