Discussion
A function is invoked 2 million times a month and runs for 200 milliseconds each time. What is the total compute time?
Answer: B
Correct answer: about 111 hours
\[ 2{,}000{,}000 \times 0.2\ \mathrm{s} = 400{,}000\ \mathrm{s}, \qquad \frac{400{,}000}{3600} = 111\ \mathrm{hours}. \] The 400 hours offered leaves the answer in seconds-derived units without dividing by 3600 properly, and 111 hours a month against the 730 hours a continuously running instance would bill is exactly why the model is cheap for this workload.
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