Current documented limits
| Constraint | Current value | Scope | Verified source |
|---|---|---|---|
| hosting-plan execution timeoutThe functionTimeout host.json setting controls the app within the plan ceiling. | Consumption: 5m default, 10m max; other plans: 30m default, unbounded max with caveats | Hosting-plan specific | MicrosoftAug 22, 2026 |
| HTTP load-balancer response ceilingThe HTTP response cap applies even when the hosting plan permits longer background execution. | 230 seconds | HTTP-triggered functions | MicrosoftAug 22, 2026 |
| language worker startupThe worker process must start and initialize within the documented window. | 60 seconds | All hosting plans | MicrosoftAug 22, 2026 |
How to apply Azure Functions limits safely
The monitored baseline covers hosting-plan execution timeout, HTTP load-balancer response ceiling, language worker startup. Treat these as separate constraints rather than one platform-wide capacity number: a workload can fit one row and still fail another because the plan, model, endpoint, runtime, region, invocation mode, or account scope differs.
- Match the production workload to the exact scope printed beside each value and confirm it in the active Azure Functions console, configuration, or response headers.
- Measure the serialized request, token volume, duration, concurrency, storage, or connection demand at realistic percentiles, then preserve headroom for bursts and retries.
- Check every adjacent layer—client, SDK, gateway, proxy, queue, database, and downstream service—for a smaller effective limit before changing architecture.
Specific limit pages
These pages exist because the constraint has a distinct implementation or troubleshooting intent. Closely related keyword variations stay consolidated.
Azure Functions Execution Timeout
Azure Functions Execution Timeout, verified against Azure Functions's official documentation with scope, implementation impact, caveats, and a direct check.
Azure Functions HTTP Response Timeout
Azure Functions HTTP Response Timeout, verified against Azure Functions's official documentation with scope, implementation impact, caveats, and a direct check.
Azure Functions Worker Startup Limit
Azure Functions Worker Startup Limit, verified against Azure Functions's official documentation with scope, implementation impact, caveats, and a direct check.