diff --git a/INSTALL.md b/INSTALL.md
index 608b3508..92132a96 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -43,6 +43,8 @@ There are a couple of environment variables you can set to configure OSEM.
 | OSEM_GITHUB_KEY | *string*			| OMNIAUTH Developer Key for GitHub
 | OSEM_GITHUB_SECRET | *string*			| OMNIAUTH Developer Secret for GitHub
 | OSEM_SCHEDULE_CELL_SIZE | *integer*		| Schedule timeslot size to use (in minutes), should be greater than zero, should be divisor of 60
+| OSEM_SCHEDULE_START_HOUR | *integer* 		| Schedule start hour, should be greater than zero
+| OSEM_SCHEDULE_END_HOUR | *integer* 		| Schedule end hour, should be greater than zero
 | OSEM_SMTP_ADDRESS		| smtp.opensuse.org		| The smtp server to use
 | OSEM_SMTP_PORT		| *int*				| The port on the smtp server
 | OSEM_SMTP_USERNAME		| *string*			| The user for the smtp server
diff --git a/app.json b/app.json
index 6b28f6b9..36ee930b 100644
--- a/app.json
+++ b/app.json
@@ -58,6 +58,14 @@
       "description": "Schedule timeslot size in minutes",
       "required": false
     },
+    "OSEM_SCHEDULE_START_HOUR": {
+      "description": "Schedule start hour",
+      "required": false
+    },
+    "OSEM_SCHEDULE_END_HOUR": {
+      "description": "Schedule end hour",
+      "required": false
+    },
     "RACK_ENV": {
       "required": false
     },
diff --git a/app/models/schedule.rb b/app/models/schedule.rb
index b14a978c..40b5bfff 100644
--- a/app/models/schedule.rb
+++ b/app/models/schedule.rb
@@ -5,6 +5,9 @@ class Schedule < ActiveRecord::Base
 
   has_paper_trail ignore: [:updated_at], meta: { conference_id: :conference_id }
 
+  START_HOUR = (ENV['OSEM_SCHEDULE_START_HOUR']).nil? ? 9 : ENV['OSEM_SCHEDULE_START_HOUR'].to_i
+  END_HOUR = (ENV['OSEM_SCHEDULE_END_HOUR']).nil? ? 18 : ENV['OSEM_SCHEDULE_END_HOUR'].to_i
+
   private
 
   def conference_id
diff --git a/app/views/admin/schedules/_day_tab.html.haml b/app/views/admin/schedules/_day_tab.html.haml
index 57be4999..a42c0adf 100644
--- a/app/views/admin/schedules/_day_tab.html.haml
+++ b/app/views/admin/schedules/_day_tab.html.haml
@@ -3,13 +3,15 @@
 / use smaller cell heights for more compact grids
 - cell_height = compact_grid ? 32 : 58
 - date_event_schedules = @event_schedules.select{ |e| e.start_time.to_date.eql? date }
+- start_hour = Schedule::START_HOUR
+- end_hour = Schedule::END_HOUR
 .row
   - @rooms.each do |room|
     .col-md-2.col-xs-6
       .room-name
         - room_date_event_schedules = date_event_schedules.select{ |e| e.room == room }
         = room.name
-      - (9*cells_per_hour..18*cells_per_hour).each do |slot|
+      - (start_hour*cells_per_hour..end_hour*cells_per_hour).each do |slot|
         - hour = slot / cells_per_hour
         - minutes = (EventType::LENGTH_STEP * (slot % cells_per_hour)).to_s.rjust(2, '0')
         - time = "#{hour}:#{minutes}"
diff --git a/dotenv.example b/dotenv.example
index 358fe094..a89b38a1 100644
--- a/dotenv.example
+++ b/dotenv.example
@@ -56,3 +56,9 @@ OSEM_ICHAIN_ENABLED=false
 
 # Schedule grid parameters, cell size in minutes
 OSEM_SCHEDULE_CELL_SIZE=15
+
+# Schedule start hour
+OSEM_SCHEDULE_START_HOUR=9
+
+# Schedule end hour
+OSEM_SCHEDULE_END_HOUR=18