I combined seconds into 3M, which is roughly 8640 (number of calls a month to keep it in cache) * 300s (timeout set so it stays in memory). My understanding of AWS lambda is that if you keep it up for 300 seconds, you get charged for that much. Because it&#x27;s #reqs * #secs. Here&#x27;s the example from the pricing page (with my comment at the end of the Total compute line):<p><i>The monthly compute price is $0.00001667 per GB-s and the free tier provides 400,000 GB-s.<p>Total compute (seconds) = 3M </i> (1s) = 3,000,000 seconds # ( roughly equals to 8640 * 300 ~ 2.6M seconds in the case of this app)<p>Total compute (GB-s) = 3,000,000 * 512MB&#x2F;1024 = 1,500,000 GB-s<p>Total compute – Free tier compute = Monthly billable compute GB- s<p>1,500,000 GB-s – 400,000 free tier GB-s = 1,100,000 GB-s<p>Monthly compute charges = 1,100,000 * $0.00001667 = $18.34<i>