--- title: Limits description: Cloudflare Queues account limits for message size, throughput, retention, and concurrency. image: https://developers.cloudflare.com/dev-products-preview.png --- > Documentation Index > Fetch the complete documentation index at: https://developers.cloudflare.com/queues/llms.txt > Use this file to discover all available pages before exploring further. [Skip to content](#%5Ftop) # Limits Warning The following limits apply to both Workers Paid and Workers Free plans with the exception of **Message Retention**, which is non-configurable at 24 hours for the Workers Free plan. | Feature | Limit | | ---------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------- | | Queues | 10,000 per account | | Message size | 128 KB 1 | | Message retries | 100 | | Maximum consumer batch size | 100 messages | | Maximum messages per sendBatch call | 100 (or 256KB in total) | | Maximum Batch wait time | 60 seconds | | Per-queue message throughput | 5,000 messages per second 2 | | Message retention period 3 | [Configurable up to 14 days](https://developers.cloudflare.com/queues/configuration/configure-queues/#queue-configuration). | | Per-queue backlog size 4 | 25GB | | Concurrent consumer invocations | 250 push-based only | | Consumer duration (wall clock time) | 15 minutes 5 | | [Consumer CPU time](https://developers.cloudflare.com/workers/platform/limits/#cpu-time) | [Configurable to 5 minutes](https://developers.cloudflare.com/queues/platform/limits/#increasing-queue-consumer-worker-cpu-limits) | | visibilityTimeout (pull-based queues) | 12 hours | | delaySeconds (when sending or retrying) | 24 hours | 1 1 KB is measured as 1000 bytes. Messages can include up to \~100 bytes of internal metadata that counts towards total message limits. 2 Exceeding the maximum message throughput will cause the `send()` and `sendBatch()` methods to throw an exception with a `Too Many Requests` error until your producer falls below the limit. 3 Messages in a queue that reach the maximum message retention are deleted from the queue. Queues does not delete messages in the same queue that have not reached this limit. 4 Individual queues that reach this limit will receive a `Storage Limit Exceeded` error when calling `send()` or `sendBatch()` on the queue. 5 Refer to [Workers limits](https://developers.cloudflare.com/workers/platform/limits/#cpu-time). Need a higher limit? To request an adjustment to a limit, complete the [Limit Increase Request Form ↗](https://forms.gle/ukpeZVLWLnKeixDu7). If the limit can be increased, Cloudflare will contact you with next steps. ### Increasing Queue Consumer Worker CPU Limits [Queue consumer Workers](https://developers.cloudflare.com/queues/reference/how-queues-works/#consumers) are Worker scripts, and share the same [per invocation CPU limits](https://developers.cloudflare.com/workers/platform/limits/#account-plan-limits) as any Workers do. Note that CPU time is active processing time: not time spent waiting on network requests, storage calls, or other general I/O. By default, the maximum CPU time per consumer Worker invocation is set to 30 seconds, but can be increased by setting `limits.cpu_ms` in your Wrangler configuration: * [ wrangler.jsonc ](#tab-panel-7300) * [ wrangler.toml ](#tab-panel-7301) JSONC ``` { // ...rest of your configuration... "limits": { "cpu_ms": 300000, // 300,000 milliseconds = 5 minutes }, // ...rest of your configuration... } ``` TOML ``` [limits] cpu_ms = 300_000 ``` To learn more about CPU time and limits, [review the Workers documentation](https://developers.cloudflare.com/workers/platform/limits/#cpu-time). ## Wall time limits by invocation type Wall time (also called wall-clock time) is the total elapsed time from the start to end of an invocation, including time spent waiting on network requests, I/O, and other asynchronous operations. This is distinct from [CPU time](https://developers.cloudflare.com/workers/platform/limits/#cpu-time), which only measures time the CPU spends actively executing your code. The following table summarizes the wall time limits for different types of Worker invocations across the developer platform: | Invocation type | Wall time limit | Details | | --------------------------------------------------------------------------------------------------- | --------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | Incoming HTTP request | Unlimited | No hard limit while the client remains connected. When the client disconnects, tasks are canceled unless you call [waitUntil()](https://developers.cloudflare.com/workers/runtime-apis/handlers/fetch/) to extend execution by up to 30 seconds. | | [Cron Triggers](https://developers.cloudflare.com/workers/configuration/cron-triggers/) | 15 minutes | Scheduled Workers have a maximum wall time of 15 minutes per invocation. | | [Queue consumers](https://developers.cloudflare.com/queues/configuration/javascript-apis/#consumer) | 15 minutes | Each consumer invocation has a maximum wall time of 15 minutes. | | [Durable Object alarm handlers](https://developers.cloudflare.com/durable-objects/api/alarms/) | 15 minutes | Alarm handler invocations have a maximum wall time of 15 minutes. | | [Durable Objects](https://developers.cloudflare.com/durable-objects/) (RPC / HTTP) | Unlimited | No hard limit while the caller stays connected to the Durable Object. | | [Workflows](https://developers.cloudflare.com/workflows/) (per step) | Unlimited | Each step can run for an unlimited wall time. Individual steps are subject to the configured [CPU time limit](https://developers.cloudflare.com/workers/platform/limits/#cpu-time). | ```json {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"/directory/","name":"Directory"}},{"@type":"ListItem","position":2,"item":{"@id":"/queues/","name":"Queues"}},{"@type":"ListItem","position":3,"item":{"@id":"/queues/platform/","name":"Platform"}},{"@type":"ListItem","position":4,"item":{"@id":"/queues/platform/limits/","name":"Limits"}}]} ```