diff --git a/biscuit/apps/chronos/pdf.py b/biscuit/apps/chronos/pdf.py
index d761cd96d41ba10c15da5eb9edae591819eb3b94..e31d53081824c94253dbab80bf8a0fe74fda07d7 100644
--- a/biscuit/apps/chronos/pdf.py
+++ b/biscuit/apps/chronos/pdf.py
@@ -1,12 +1,12 @@
 import os
 import subprocess
+import inspect # delete this line
 
 from django.template.loader import render_to_string
 
 from schoolapps.settings import BASE_DIR
 from debug.models import register_log_with_filename
 
-
 LOGO_FILENAME = os.path.join(BASE_DIR, "static", "common", "logo.png")
 
 
diff --git a/biscuit/apps/chronos/views.py b/biscuit/apps/chronos/views.py
index b0a7b6be4f260609cbe161fb67f905aec14b506c..cf052e7d034d60791f2d34f26a3f60b218bb538d 100755
--- a/biscuit/apps/chronos/views.py
+++ b/biscuit/apps/chronos/views.py
@@ -1,6 +1,8 @@
 import datetime
 import os
+import time
 import traceback
+from typing import List
 
 from PyPDF2 import PdfFileMerger
 from django.contrib.auth.decorators import login_required, permission_required
@@ -17,7 +19,7 @@ from timetable.hints import get_all_hints_by_time_period, get_all_hints_by_class
 from timetable.pdf import generate_class_tex_header, generate_class_tex_body, generate_pdf
 
 from untisconnect.plan import get_plan, TYPE_TEACHER, TYPE_CLASS, TYPE_ROOM, parse_lesson_times
-from untisconnect.sub import get_substitutions_by_date, generate_sub_table, get_header_information
+from untisconnect.sub import get_substitutions_by_date, generate_sub_table, get_header_information, SubRow
 from untisconnect.api import *
 from untisconnect.events import get_all_events_by_date
 from userinformation import UserInformation
@@ -302,6 +304,55 @@ def get_next_weekday_with_time(date, time):
 # SUBSTITUTIONS #
 #################
 
+# TODO: Move to own helper file later
+def equal(sub_row_1: SubRow, sub_row_2: SubRow) -> bool:
+    """
+    Checks the equality of two sub rows
+
+    :param sub_row_1: SubRow 1
+    :param sub_row_2: SubRow 2
+    :return: Equality
+    """
+    return sub_row_1.classes == sub_row_2.classes and sub_row_1.sub and sub_row_2.sub and \
+           sub_row_1.sub.teacher_old == sub_row_2.sub.teacher_old and \
+           sub_row_1.sub.teacher_new == sub_row_2.sub.teacher_new and \
+           sub_row_1.sub.subject_old == sub_row_2.sub.subject_old and \
+           sub_row_1.sub.subject_new == sub_row_2.sub.subject_new and \
+           sub_row_1.sub.room_old == sub_row_2.sub.room_old and \
+           sub_row_1.sub.room_new == sub_row_2.sub.room_new and \
+           sub_row_1.sub.text == sub_row_2.sub.text
+
+
+def merge_sub_rows(sub_table: List[SubRow]) -> List[SubRow]:
+    """
+    Merge equal sub rows with different lesson numbers to one
+
+    :param sub_table:
+    :return:
+    """
+    new_sub_table = []
+    i = 0
+    while i < len(sub_table) - 1:
+        j = 1
+
+        while equal(sub_table[i], sub_table[i + j]):
+            j += 1
+            if i + j > len(sub_table) - 1:
+                break
+        if j > 1:
+            new_sub_row = sub_table[i]
+            new_sub_row.lesson = sub_table[i].lesson + '-' + sub_table[i + j - 1].lesson
+            new_sub_table.append(new_sub_row)
+        else:
+            new_sub_table.append(sub_table[i])
+            # get last item
+            if i == len(sub_table) - 2:
+                new_sub_table.append(sub_table[i + 1])
+                break
+        i += j
+    return new_sub_table
+
+
 def sub_pdf(request, plan_date=None):
     """Show substitutions as PDF for the next weekday (specially for monitors)"""
 
@@ -326,6 +377,7 @@ def sub_pdf(request, plan_date=None):
         subs = get_substitutions_by_date(date)
 
         sub_table = generate_sub_table(subs, events)
+        sub_table = merge_sub_rows(sub_table)
 
         # Get header information and hints
         header_info = get_header_information(subs, date, events)
@@ -387,6 +439,9 @@ def substitutions(request, year=None, month=None, day=None):
 
     sub_table = generate_sub_table(subs, events)
 
+    # Merge Subs
+    sub_table = merge_sub_rows(sub_table)
+
     # Get header information and hints
     header_info = get_header_information(subs, date, events)
     hints = list(get_all_hints_by_time_period(date, date))