Measuring Time Saved: The Honest Agentic SRE ROI Math

The 80% MTTR reduction claim. What it usually means, what it should mean, and how to measure it in a way that holds up to a sceptical CFO.

The 80% MTTR claim

Vendors claim 80% MTTR reduction. The number is real for the cases the agent handles.

It is misleading because most marketing applies the 80% to ALL incidents, not the subset.

Honest math: (% of incidents handled by agent) × (average reduction within that subset) = blended improvement.

Realistic numbers by year

Year 1: agent handles 30-40% of in-scope incidents. Reduction within those: 60%. Blended: ~20% MTTR reduction.

Year 2: agent handles 50-65%. Reduction within those: 70%. Blended: ~40% reduction.

Year 3: agent handles 70-85%. Reduction within those: 75%. Blended: ~60% reduction.

These numbers cluster around "good but not magical." Honest reporting prevents the credibility crash.

How to measure

Per-incident MTTR with and without agent involvement. Match by service and incident type.

Use the same incident classification scheme. Apples-to-apples.

Quarterly review. Trends over months are more reliable than week-to-week.

What the CFO will ask

What is the actual time saved per quarter? Hours, with confidence intervals.

What is the dollar value of that time? Engineer hourly rate × hours saved + downtime cost reduction.

What did we spend? Vendor cost + engineering time + opportunity cost.

What is the net? Be honest. A modest positive number is more credible than an inflated one.

Holding the line on honesty

Pressure to inflate the number will be real. "Marketing wants 80%; can we round up?" Resist.

Inflated numbers crash. The first time leadership realises the actual impact is half what was claimed, the program loses budget.

Honest numbers compound. "This program reliably delivered 40% MTTR reduction year-over-year" is a story that sustains funding.