AWS Lambda Web Functions keep billing memory for 7 minutes after the last request
AWS Lambda Web Functions keep billing memory ~7 minutes after the last request
Easel tested AWS Lambda Web Functions and found execution environments stay alive and bill memory for 5–7 minutes after the last request—up to 1,700 times the request duration in metered memory time. Even after terminating idle environments, AWS logged each exit as a runtime failure. Easel switched to self-operated compute, which delivered 1.5–3× faster warm requests and 3.5× faster cold starts than Web Functions.
For a 200ms request followed by 345 seconds of inactivity, that's roughly 1,700 times the request duration in metered memory time.