Limits

Feature	Limit
Queues	100 per account ¹
Maximum message size	128 KB ²
Maximum message retries	100
Maximum batch size	100 messages
Maximum batch wait time	30 seconds
Maximum per-queue message throughput ³	400 messages per second ⁴
Maximum message retention period ⁵	4 days (96 hours)
Maximum per-queue backlog size ⁶	25GB
Maximum concurrent consumer invocations	10
Maximum consumer invocation duration	15 minutes (Refer to Worker limits.)

Notes:

¹ Request adjustments to limits that conflict with your project goals by contacting Cloudflare. To request an increase to a limit, complete the Limit Increase Request Form and we will contact you with next steps.
² 1 KB is measured as 1000 bytes. Messages can include up to ~100 bytes of internal metadata that counts towards total message limits.
³ The maximum message throughput per queue will continue to increase during the beta period.
⁴ 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.
⁵ 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.
⁶ Individual queues that reach this limit will receive a Storage Limit Exceeded error when calling .send or .sendBatch on the queue.