UK trials put Copilot's saving at 12 to 43 minutes a day; the stricter, the lower
Four UK public-sector Copilot trials and an NBER study of 5,179 support agents: what AI measurably saved a team, and who gained most. As of September 2026.
The best-measured benefit of workplace AI is a few minutes a day, and the number shrinks as the measurement gets stricter: 43 minutes when NHS staff reported it, 12 when HMRC trimmed its own survey answers.1 4 The 2023 original of this piece asked what AI could do for a growing business and answered with consultancy percentages. By September 2026 there is better evidence: large trials with thousands of users, some of them against a group that did not get the tool.
01Four trials, four answers
The UK government has run the largest public trials of Microsoft 365 Copilot. The NHS put it in front of more than 30,000 staff in 90 organisations and reported an average of 43 minutes a day saved.1 The Government Digital Service gave it to 20,000 civil servants in 12 organisations from September to December 2024 and reported 26 minutes a day, from users’ own estimates.2 The Department for Work and Pensions compared 1,716 users with 2,535 colleagues who had no licence and found 19 minutes.3 HMRC allocated 3,000 licences at random, cut its staff’s self-reported savings by about 20% for optimism, and landed on roughly 60 minutes a week.4
The more carefully a UK department measured Copilot, the fewer minutes it found
Average time saved per user per working day with Microsoft 365 Copilot, minutes, UK public-sector trials reported June 2025 to July 2026
Source: DHSC; Government Digital Service; DWP evaluation as reported by The Register; HMRC evaluation · as of 30 September 2026 · HMRC's 60 minutes a week divided by five working days. Methods differ; the order is the point, not the gap between bars
02Who gains most: the newest people
The strongest controlled evidence is outside the office suite. Erik Brynjolfsson and colleagues followed 5,179 customer-support agents as a generative-AI assistant was rolled out: issues resolved per hour rose 14% on average and 34% for novice and low-skilled agents.6 That is the benefit a growing business should care about. It hires faster than it can train, and the tool narrows the gap between the person who joined last month and the one who has done the job for years.
In India, the suite assistants are listed in USD; bought through an Indian reseller the invoice is in INR plus 18% GST, and imported directly the GST falls on you under reverse charge.7 Prompts and the documents they draw on carry customer and employee names, so they are personal data under the DPDP Act: the Rules were notified on 13 November 2025 and the security-safeguard and breach-notice duties apply from 13 May 2027.8 CERT-In’s Directions of 28 April 2022 already require a reportable incident, including a compromised AI-enabled account, to be reported within six hours.9
Sources
- Department of Health and Social Care, Major NHS AI trial delivers unprecedented time and cost savings (30,000+ staff, 90 organisations, 43 minutes a day) — 21 October 2025
- Government Digital Service, Microsoft 365 Copilot Experiment: Cross-Government Findings Report (20,000 staff, 12 organisations, 30 September to 31 December 2024) — 2 June 2025
- The Register, DWP finds Copilot saves civil servants 19 minutes a day (1,716 users, 2,535 non-users, October 2024 to March 2025) — 4 February 2026
- HMRC, Evaluating the impact of Microsoft Copilot in HMRC (3,000 randomly allocated licences; about 60 minutes a week after a 20% adjustment) — 9 July 2026
- Office Watch, Copilot saves “43 minutes a day”? The real number is 12 — 2 September 2026
- Brynjolfsson, Li and Raymond, Generative AI at Work, NBER Working Paper 31161 (5,179 agents; +14% on average, +34% for novice and low-skilled workers) — April 2023, revised November 2023
- India Briefing, Digital services in India: OIDAR, GST applicability and reverse charge — updated 29 September 2023
- Legismith Partners, DPDP Rules 2025 commencement timeline — Rules notified 13 November 2025
- CERT-In, Directions under section 70B(6) of the IT Act, 2000 (six-hour reporting) — 28 April 2022
Related on TechBag: the Microsoft Copilot page covers what a pilot should measure; the data security posture guide covers the tools that find over-shared files before an assistant does.
Disclosure. TechBag is a software reseller: it earns a margin when a reader buys through it, including from vendors named here. The analysis is TechBag’s own; no vendor paid for or saw this piece before publication. Facts are labelled reported, TechBag count or our view.
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