Continuous improvement hours: time spent making things better, not just keeping them running

A reliability engineer spends three hours a week reviewing failure data and looking for patterns. A supervisor joins a two-hour fishbone session after a safety incident. A planner gives a morning to a lean project on planning accuracy. None of those hours fixed a single piece of equipment that day.

But every one of them was maintenance labour invested in reducing future failures rather than reacting to current ones. Continuous improvement hours makes that investment visible, so it can be protected, tracked, and grown rather than quietly squeezed out by the next emergency.

What it actually measures

Continuous improvement hours is the percentage of total internal maintenance and operator hours spent on improvement activities rather than routine execution. That covers lean and six sigma work, work process and practice redesign, work sampling, root cause analysis, reliability engineering projects, and any other structured effort to improve availability, reliability, quality, productivity, safety or cost. The denominator is all internal hours, straight time and overtime, including operators, supervisors, planners, managers and storeroom staff; contractors are excluded from both sides, because this measures the organisation's investment in its own capability.

How to work it out

Continuous improvement hours (%) = (Improvement hours × 100) / Total internal maintenance and operator hours

A plant works 8,400 internal maintenance hours in a month and spends 110 of them across various improvement projects:

Continuous improvement hours = (110 × 100) / 8,400 = 1.3%

Barely more than one hour in every hundred is going into deliberate improvement. With a target above five per cent, there is real room to grow that investment without disrupting day-to-day operations.

What good looks like

Best-in-class is greater than five per cent, roughly one hour in every twenty directed at lasting improvement rather than today's workload. It sounds modest until you realise how rare it is; in a busy reactive plant, the figure is often a fraction of a per cent, because every available hour is swallowed by the current level of failure.

Why it is the lever that breaks the cycle

There is a reason this modest-looking number matters out of all proportion to its size. A maintenance organisation with no protected improvement time spends every single hour it has managing the current rate of failure, which all but guarantees that next year's failure rate looks much like this year's. Improvement is the only thing that changes the baseline, and improvement takes hours that have to come from somewhere. The cruel irony is that continuous improvement time is almost always the first thing sacrificed when the plant gets busy, which is precisely when the firefighting is worst and the improvement is needed most. That is how a reactive plant stays reactive: not because nobody knows what to fix, but because nobody is ever given the hours to fix it. Carving out and then fiercely protecting these hours, even at five per cent, is one of the few levers that genuinely breaks the loop.

Where it can mislead you

• Continuous improvement is a sustained philosophy, not a one-off. A single fix does not count; the activities have to be part of an ongoing effort.
• Some organisations prefer to track the raw hours, but the percentage form is better, because it normalises across plants of different sizes and makes benchmarking meaningful.
• Contractors are excluded from both the top and bottom. This metric is about the organisation's investment in its own improvement capability.
• A low figure in a reactive environment is expected, but it is also part of what keeps that environment reactive. Protecting and growing these hours is one of the few levers that actually breaks the cycle.

Continuous improvement hours answers a quietly decisive question: is your team investing in a better future, or only managing the present? A plant that never carves out time to improve is condemned to keep fighting the same fires, and this is the number that shows whether you have started to buy your way out.