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; the honest math is (% of incidents handled by agent) times (average reduction within that subset) equals the blended improvement.

Realistic numbers by year

The realistic ramp is well-documented. 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.”

How to measure

Measurement matters as much as the math. Per-incident MTTR with and without agent involvement, matched by service and incident type; use the same incident classification scheme so the comparison is apples-to-apples; quarterly review because trends over months are more reliable than week-to-week.

What the CFO will ask

The CFO has four questions. What is the actual time saved per quarter (hours, with confidence intervals)? What is the dollar value of that time (engineer hourly rate times hours saved plus downtime cost reduction)? What did we spend (vendor cost plus engineering time plus 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 is real. “Marketing wants 80%; can we round up?” Resist; inflated numbers crash because 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.