Guides

Promising response times you can actually keep

Most service commitments fail not on the time but on the clock: a four-hour response time that starts on Friday evening is long breached by Monday morning – without anyone having done anything wrong.

Author
Dr.-Ing. Philipp Schwittek
Reading time
6 minutes
Updated
05. September 2026
The key points
  • A deadline without service hours is not a commitment but a trap.
  • Response time can be promised, resolution time usually cannot – the difference belongs in the contract.
  • Three priority levels are enough. Four stop being distinguished, five get guessed.
  • Let customers choose the priority and you will only ever receive "high".
01

The clock matters more than the number

Whether you promise four hours or eight matters less than when those hours count. A deadline has to be tied to agreed service hours and pause outside them – weekends, public holidays and shutdowns included. Without that tie, every commitment is breached regularly for reasons that have nothing to do with the work. And a metric that is red for systematic reasons stops being looked at.

02

Promise response, not resolution

Time to the first qualified answer is in your hands: it depends on staffing and organisation. Time to resolution depends on the matter – on spare parts, on suppliers, on questions only the customer can answer. Promising both means one of them was promised carelessly. The clean version: response time binding, resolution time as a target with a rule for how and how often progress is reported.

  • Response time: until the first substantive answer from a person
  • An acknowledgement is not a response – automatic replies do not count
  • Resolution time: a target, not a promise
  • Questions back to the customer pause the clock, or you pay for their reply time
  • The rule for progress reports belongs in the agreement
03

Three levels, clearly separated

Priorities only work if they are distinguished – and only what can be described gets distinguished. Three levels with one hard criterion have proven themselves: if operations are down, it is high. If they are restricted but a workaround exists, it is medium. Everything else is normal. What matters is that the classification is yours and not the caller's: let customers choose and within two weeks everything is high priority, which means nothing is.

Overview

A proposal that holds up in practice

Level Criterion Response Progress report
High Operations down, no workaround 2 service hours daily
Medium Restriction with workaround 8 service hours every 3 days
Normal everything else 2 service days on request
Frequently asked questions

Frequently asked questions about Service hours and SLAs

What is the difference between response and resolution time?

Response time ends with the first substantive answer from a person – an automatic acknowledgement does not count. Resolution time ends when the matter is settled. Only the first can be promised bindingly, because only it lies entirely in your hands.

Does an SLA have to apply around the clock?

Only if you are staffed around the clock. For most technical businesses a commitment within service hours is more honest and is accepted by customers – breached commitments cost more trust than a generous one ever earns.

How many priority levels make sense?

Three. With four the middle ones blur, with five they get guessed. What matters is less the number than the criterion: it has to fit in one sentence and be applicable without asking back.

About the author

Dr.-Ing. Philipp Schwittek

Managing Director, Entracon Planungsgesellschaft mbH

Engineer with a doctorate, specialising in plant engineering, digital design and process automation – from simulation through to commissioning.

  • Sizing
  • Design
  • Plant engineering
  • Standards and safety
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