diff --git a/cpdctrl_gui/ui/widgets/led_script.py b/cpdctrl_gui/ui/widgets/led_script.py
index 98a941c..cfaac39 100644
--- a/cpdctrl_gui/ui/widgets/led_script.py
+++ b/cpdctrl_gui/ui/widgets/led_script.py
@@ -1,4 +1,4 @@
-from PyQt6.QtWidgets import QWidget, QVBoxLayout, QLabel, QScrollArea, QTableView
+from PyQt6.QtWidgets import QWidget, QVBoxLayout, QLabel, QScrollArea, QTableView, QFormLayout
 from PyQt6.QtCore import QAbstractTableModel, QModelIndex, Qt
 
 import numpy as np
@@ -6,29 +6,68 @@ from cpdctrl.led_script import LedScript
 
 import time
 import datetime
+
+
+timedelta = [("d", 24*3600), ("h", 3600), ("m", 60), ("s", 1)]
+def duration_to_string(duration: float) -> str:
+    """
+    Convert a duration in seconds to a string of the form "<days>d <hours>h <minutes>m <seconds>s"
+    where only the largest units are included.
+    Parameters
+    ----------
+    duration: float
+        Duration in seconds.
+
+    Returns
+    -------
+       String representation of the duration.
+    """
+    include = False
+    s = ""
+    sign = 1 if duration > 0 else -1
+    time_left = abs(int(duration))
+    for i, (unit, unit_seconds) in enumerate(timedelta):
+        t = int(time_left / unit_seconds)
+        if t != 0 or include or unit == "s":
+            s += f"{sign*t:02}{unit} "
+            include = True
+        time_left %= unit_seconds
+    return s.strip()
+
 class TimeLeft(QWidget):
     def __init__(self, parent=None):
         super().__init__(parent)
         self.t_end = None
-        self.setLayout(QVBoxLayout())
-        self.layout().addWidget(QLabel("Time left"))
+        self.t_start = None
+        self.setLayout(QFormLayout())
+        self.setLayout(QFormLayout())
+        self.w_time_passed = QLabel("N.A.")
+        self.layout().addRow(QLabel("Time passed:"), self.w_time_passed)
         self.w_time_left = QLabel("N.A.")
-        self.layout().addWidget(self.w_time_left)
+        self.layout().addRow(QLabel("Time left:"), self.w_time_left)
         self.w_end_time = QLabel("N.A.")
-        self.layout().addWidget(self.w_end_time)
+        self.layout().addRow(QLabel("End time:"), self.w_end_time)
 
-    def set_end_time(self, t_end: float):
+    def reset(self):
+        self.t_start = None
+        self.t_end = None
+        self.w_time_passed.setText("N.A.")
+        self.w_time_left.setText("N.A.")
+        self.w_end_time.setText("N.A.")
+
+    def set_start_end_time(self, t_start: float, t_end: float):
         """
         Set the end time
         Parameters
         ----------
+        t_start
+            The start time in seconds since epoch
         t_end
             The end time in seconds since epoch
         """
+        self.t_start = t_start
         self.t_end = t_end
-        self.w_end_time.setText(
-            datetime.datetime.fromtimestamp(t_end).strftime("%Y-%m-%d %H:%M:%S")
-        )
+        self.w_end_time.setText(datetime.datetime.fromtimestamp(t_end).strftime("%Y-%m-%d %H:%M:%S"))
 
     def update_time(self, t_now: float):
         """
@@ -39,18 +78,8 @@ class TimeLeft(QWidget):
            The current time in seconds since epoch
         """
         if self.t_end is None: raise RuntimeError("Update called before end time was set")
-        # convert to format <days>d, <hours>h, <minutes>m, <seconds>s
-        print(self.t_end, t_now, self.t_end - t_now)
-        sign = 1 if self.t_end > t_now else -1
-        time_left = abs(int(self.t_end - t_now))
-        days = sign * int(time_left / (24 * 3600))
-        time_left %= (24 * 3600)
-        hours = sign * int(time_left / 3600)
-        time_left %= 3600
-        minutes = sign * int(time_left / 60)
-        time_left %= 60
-        seconds = sign * int(time_left)
-        self.w_time_left.setText(f"{days}d, {hours:02}h, {minutes:02}m, {seconds:02}s")
+        self.w_time_left.setText(duration_to_string(self.t_end - t_now))
+        self.w_time_passed.setText(duration_to_string(t_now - self.t_start))
 
 
 
@@ -110,6 +139,8 @@ class LedScriptTableModel(QAbstractTableModel):
                 flags |= Qt.ItemFlag.ItemIsEditable
         return flags
 
+    def update_time(self, t_now: float):
+        self.dt = self.led_script.get_dt(t_now)
 
 
 
@@ -149,5 +180,8 @@ class LedScriptViewer(QWidget):
         raise NotImplementedError()
 
     def update_time(self, t_now: float):
+        self.model.update_time(t_now)
         self.w_time_left.update_time(t_now)
+        self.w_table.update()
+