How many partitions were usually in each topic?

The number of partitions in each topic depends on performance requirements, data volume, and processing parallelism. Typically, for large systems, the number of partitions ranges from a few dozen to hundreds.

For example, in high-load projects with many consumers, I have seen topics with 50-100 partitions, which allowed scaling processing and ensuring high throughput.

However, too many partitions can lead to excessive management overhead and reduced efficiency, so it is important to balance between parallelism and support complexity.