The 15-minute function wall just fell. aws lambda, updated september 9, now runs asynchronous jobs…
the 15-minute function wall just fell. aws lambda, updated september 9, now runs asynchronous jobs up to 90 minutes on managed instances, a 6x jump for batch and media workloads.
the serverless pitch is quietly absorbing the batch box.
Context
AWS's What's New post and Compute Blog post, both of September 9, 2026, announce a 90-minute (5,400 second) function timeout for asynchronous and event source mapping invocations on Lambda Managed Instances, a 6x increase from the previous 15-minute limit. They name data processing, media transcoding, financial calculations, AI inference and batch as use cases. The blog says synchronous invocations keep the existing 15-minute maximum, that Amazon MQ and Amazon DocumentDB event source mappings stay at 15 minutes, and that there is no additional charge for the longer timeout beyond standard Lambda Managed Instances pricing.
This is a timeout limit and not a throughput or cost figure, and 6x is the ratio of two maximum configurable timeouts. The 15-minute limit is unchanged for synchronous calls, for the MQ and DocumentDB mappings and for standard event-driven functions, so the wall fell only on the narrow path above, and describing it as asynchronous jobs on managed instances is accurate. Absorbing the batch box is the author's opinion.
Related work
- Serverless functions just got a 6x longer leash ↗An earlier note on the same announcement.
Watch next
- Durable functions as an option for restart-safe long jobs.
Sources
Provenance
The note above is reproduced unedited from the original post, first published on Threads on 22 September 2026 at 10:18 IST. Sources are the papers and datasets the note draws on.
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