Although you are probably familiar with using System Log Parser (SLP) to read logs and help you quantify your ArcGIS Enterprise usage, there is a relatively new feature in this popular, free utility that can make the effort easier and the analysis more powerful.
The new feature, commonly referred to as the Optimized report in System Log Parser, allows you perform log queries of much larger time spans. In addition, it can perform the parsing faster and with tremendous memory savings over the classic analysis types (e.g. Simple, WithOverviewCharts and Complete).
The Optimized option still generates a spreadsheet-based report statistically summarizing the collected log information into key time focused categories.