这个问题不如直接查文档了：《Amazon SQS quotas》
highlight一些：
- Delay Queue: 0-15min
- Listed queues: 1000
- Long polling: 20sec
- Message Retention: 4days (1min – 14 days)
- Message Throughput: unlimited for SQS, 300 API calls for SQS FIFO, 3000 for SQS FIFO + batching.
- Message size: 256KB
