what is the best practice or recommendation for Reports and Books for the number of Grids?

Summary:

what is the best practice or recommendation for Reports and Books for the number of Grids?

Content (please ensure you mask any confidential information):

In NR, There is general practice to keep the size of artifact to be small, be it Report Package or Report, or Book, for the sake of Performance and Rendering delays or latency issues.

1. Is there a specific limit on this on How many Grids can be allowed in a report as a best practice to be in that 1 min response time (assuming a decent 20 Row x 8 Column Grid)
2. Is there a specific limit on How many Reports can be clubbed into a Report Book? (Assuming a similar size of the Report mentioned above, with 1 Grid each in the Report)