Can you help me to understand the very different figures I see in Mandiant's "M-Trends 2024" and IBM Security's "Cost of a Data Breach Report 2023"?

Hi everyone,
I'm reading Mandiant's most recent M-Trends Special Report - Excutive Edition ([grab you copy here](https://services.google.com/fh/files/misc/m-trends-2024-executive-edition.pdf)) and the second sentence is (emphasis mine)

>Dwell time is **the number of days an attacker is on a system from compromise to detection**, and **in 2023** the global median dwell time **is 10 days**, down from 16 days in 2022 .

Now, IBM Security ([here](https://www.ibm.com/reports/data-breach)) reports were different figures for what I see as similar metrics:

>Compared to 2022, both the mean …

attacker breach can compromise cost cost of a data breach cost of a data breach report cybersecurity data data breach data breach report detection down dwell time global ibm ibm security mandiant report security system trends understand