Minor nit, it's 1M requests and 400,000GB-seconds of runtime. Running a 128MB instance gets you the 3.2M seconds number, but if you need more memory then that n

Minor nit, it's 1M requests and 400,000GB-seconds of runtime. Running a 128MB instance gets you the 3.2M seconds number, but if you need more memory then that number drops fast. Assuming roughly 1 second per-request you max out at 384MB of memory to stay in the free tier.