diff --git a/tracetools_analysis/tracetools_analysis/__init__.py b/tracetools_analysis/tracetools_analysis/__init__.py
index e4deba3..94788ac 100644
--- a/tracetools_analysis/tracetools_analysis/__init__.py
+++ b/tracetools_analysis/tracetools_analysis/__init__.py
@@ -12,5 +12,23 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-"""Reading and interpreting of LTTng trace data."""
-__author__ = 'Luetkebohle Ingo (CR/AEX3)'
+"""Tools for analysing trace data."""
+
+
+def time_diff_to_str(
+    time_diff: float,
+) -> str:
+    """
+    Format time difference as a string.
+
+    :param time_diff: the difference between two timepoints (e.g. `time.time()`)
+    """
+    if time_diff < 1.0:
+        # ms
+        return f'{time_diff * 1000:.0f} ms'
+    elif time_diff < 60.0:
+        # s
+        return f'{time_diff:.1f} s'
+    else:
+        # m s
+        return f'{time_diff // 60.0:.0f} m {time_diff % 60.0:.0f} s'
diff --git a/tracetools_analysis/tracetools_analysis/convert.py b/tracetools_analysis/tracetools_analysis/convert.py
index 545bc73..c2384a2 100644
--- a/tracetools_analysis/tracetools_analysis/convert.py
+++ b/tracetools_analysis/tracetools_analysis/convert.py
@@ -22,6 +22,8 @@ from typing import Optional
 
 from tracetools_analysis.conversion import ctf
 
+from . import time_diff_to_str
+
 
 DEFAULT_CONVERT_FILE_NAME = 'converted'
 
@@ -61,7 +63,7 @@ def convert(
     start_time = time.time()
     count = ctf.convert(trace_directory, output_file_path)
     time_diff = time.time() - start_time
-    print(f'converted {count} events in {time_diff * 1000:.2f} ms')
+    print(f'converted {count} events in {time_diff_to_str(time_diff)}')
     print(f'output written to: {output_file_path}')
 
 
diff --git a/tracetools_analysis/tracetools_analysis/process.py b/tracetools_analysis/tracetools_analysis/process.py
index 77f7714..d7ea399 100644
--- a/tracetools_analysis/tracetools_analysis/process.py
+++ b/tracetools_analysis/tracetools_analysis/process.py
@@ -28,6 +28,8 @@ from tracetools_analysis.loading import load_file
 from tracetools_analysis.processor.ros2 import Ros2Handler
 from tracetools_read.trace import is_trace_directory
 
+from . import time_diff_to_str
+
 
 def add_args(parser: argparse.ArgumentParser) -> None:
     parser.add_argument(
@@ -136,7 +138,7 @@ def process(
 
     time_diff = time.time() - start_time
     ros2_handler.data.print_model()
-    print(f'processed {len(events)} events in {time_diff * 1000:.2f} ms')
+    print(f'processed {len(events)} events in {time_diff_to_str(time_diff)}')
 
 
 def main():