In this case study, we asked Dr. Harald Lindemann from Lindemann Legal about the outcomes he achieved after introducing timeBuzzer and what tips he has for you.

Why do you record your time?

I’m an independent lawyer specializing in corporate law, M&A, reorganization, and restructuring, with over 25 years of professional experience. That includes 18 years as a partner in a supra-local law firm with offices in Munich and Hamburg, focused on corporate and tax law as well as transactions. In addition to my legal work, I serve as chairman of the supervisory board for two industrial companies and sit on the boards of a non-profit organization and a family foundation with various entrepreneurial investments in Germany and abroad.

I bill my legal work on a time-based model at a defined hourly rate. Accurate and transparent time tracking is essential not just for me but also for my clients. As a lawyer, I’m legally required to provide a detailed timesheet with every invoice when billing by the hour.

What has changed for the better since you started using timeBuzzer?

Recording working time has always been part of my professional life. In the early days, I logged time by hand, later in Excel spreadsheets, and eventually with law firm software that introduced stopwatches. These allowed for more or less accurate tracking. But manual editing of time entries or assigning them to the right client or project remained error-prone, whether in Excel or other tools.

With timeBuzzer — and especially the hardware buzzer on my desk — I can now switch mandates and projects within seconds when a call interrupts me while I’m drafting a contract. That way, no time is lost during a busy day with frequent context switches. Thanks to the color-coded clients, I always know at a glance whether time is being recorded and for whom. There’s no need to search for the right window, check the clock, or manually enter start or end times. No more transcription errors.

I use Lexware for invoicing and bookkeeping. The integration between timeBuzzer and Lexware has given me a major productivity boost. With just a few clicks, I can filter my recorded time entries by client and project and generate a ready-to-send invoice. It includes a legally required, detailed time report in PDF format. What used to take me half a day or even a full Sunday, manually combining time records and descriptions across systems, now takes just minutes. This seamless workflow from daily tracking to monthly billing has increased my volume of billable time. At least it feels that way, because I no longer lose time.

What tips do you have for others?

Getting started with timeBuzzer is incredibly fast. The hardware buzzer is set up in less than two minutes. In the web interface, I can add new clients and projects with just a few clicks. It’s especially helpful that I can assign recurring project types, like “corporate law advice,” to multiple clients instead of creating identical entries for each new one.

The hardware buzzer is a brilliant tool. After a short adjustment period, it became second nature to use it at the start of every task or when switching between projects. That way, I track time down to the minute. It’s also very helpful that I can enter a task description directly in the buzzer app and make any adjustments to the recorded times with just a few clicks during the day.