Update sentinel-mcp-billing.md with entity analyzer results

Added information about the availability of results generated by the entity analyzer.

Author: poliveria

articles/sentinel/datalake/sentinel-mcp-billing.md

@@ -53,6 +53,8 @@ Each tenant can use the entity analyzer MCP tool up to the following limits whil
 - 500 total runs a day 
 - 10 concurrent runs at a time (based on available service capacity)
 
+Results generated by the entity analyzer are available for one hour. You need to run a new query after the tool's analysis expires.
+
 ### Triage tool
 Regular API throttling applies to the tools in the triage tool collection. In addition, tools that call the advanced hunting API are bound by the existing advanced hunting quotas and service limits. [Learn more about advanced hunting quotas and usage parameters](/defender-xdr/advanced-hunting-limits#understand-advanced-hunting-quotas-and-usage-parameters)