The verdict in three sentences
A firm billing by the hour without a rigorous tool forgets 10 to 15% of its billable hours — the most profitable money there is, since the work is already done. Time-tracking software with mobile capture, per-matter rates and automatic billing costs between 25,000 and 60,000 EUR and ships in 8 to 12 weeks. In London in 2026, the investment pays back in a few months thanks to the +12% of billable hours reclaimed.
Where billable hours leak
Delayed entry is the firm's enemy. A lawyer logging time at day's end — or worse, week's end — systematically undervalues what they actually produced. A tool that captures time as it happens, on mobile and desktop, closes that leak.
| Leak source | Estimated loss | Tool's fix |
|---|---|---|
| End-of-day recall entry | 5 to 8% | Real-time timer |
| Untracked micro-tasks (calls, emails) | 3 to 5% | 2-tap mobile entry |
| Time lost between matters | 2 to 4% | Automatic suggestion |
| Hourly-rate errors | 1 to 3% | Per-matter/client rate |
| Billing delays | Cash flow | Automated billing |
Added up, these leaks often exceed 12% of billable revenue — for a firm at 900,000 EUR in fees, over 100,000 EUR a year.
Hours ROI: the math on an average firm
Take a London firm of 10 lawyers, each billing on average 1,300 hours a year at 200 EUR/h. Here is the effect of a 12% gain in captured hours.
| Indicator | Before tool | After tool (+12%) |
|---|---|---|
| Hours billed / lawyer / year | 1,300 h | 1,456 h |
| Hours reclaimed / lawyer | — | 156 h |
| Value reclaimed / lawyer | — | 31,200 EUR |
| Firm of 10 lawyers | — | 312,000 EUR |
| Tool cost (build) | — | 45,000 EUR |
| Return on investment | — | ~7 weeks |
Even dividing this gain by three to stay conservative, the firm reclaims over 100,000 EUR a year for a one-off 45,000 EUR investment.
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Mini case study
Ms. Rousseau runs a 10-lawyer business firm in the City of London. Her internal audit reveals staff log time on average 3 days after the work, with an estimated 11% under-declaration. On 900,000 EUR of annual fees, that is roughly 99,000 EUR unbilled.
By deploying a mobile-capture tool (45,000 EUR build, 10 weeks), the firm targets reclaiming at least half that leak, i.e. 49,500 EUR/year. The return on investment lands within the first year, and the gain recurs in following years.
FAQ
How much does a custom time-tracking tool cost? Between 25,000 and 60,000 EUR depending on scope: mobile capture, per-matter rates, automatic billing, accounting export and dashboards. A simple core starts around 25,000 EUR.
How long until it is operational? Expect 8 to 12 weeks from scoping to go-live, team training included. Migrating billing history can add 1 to 2 weeks.
Do lawyers actually adopt mobile capture? Yes, provided it takes under 10 seconds. A one-gesture timer and automatic suggestions make the difference between 60% and 95% adoption.
Can it handle multiple hourly rates per client or matter? Absolutely. The tool automatically applies the right rate by matter, staff member and task type, avoiding costly manual errors.
How does it connect to accounting? Via a standard export (CSV) or a direct integration with your accounting software, scoped in the specification.
Let's scope your project. Tell us your billable headcount, annual fee volume and current tool: we scope a perimeter between 25,000 and 60,000 EUR and the expected ROI. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
