diff --git a/app/models/schedule.rb b/app/models/schedule.rb
index 1f55686..60283f0 100644
--- a/app/models/schedule.rb
+++ b/app/models/schedule.rb
@@ -1,12 +1,37 @@
 class Schedule < ActiveRecord::Base
+  DEFAULT_RUNS = [
+    'Level=Full 1st sun at ',
+    'Level=Differential 2nd-5th sun at ',
+    'Level=Incremental mon-sat at '
+  ]
+
+  attr_accessor :runtime
+
   serialize :runs, JSON
 
   validates :name, :runs, presence: true
 
+  before_validation :set_runs, if: Proc.new { |s| s.runtime.present? }
+
   def to_bacula_config_array
     ['Schedule {'] +
       ["  Name = \"#{name}\""] +
       runs.map {|r| "  Run = #{r}" } +
       ['}']
   end
+
+  private
+
+  def set_runs
+    if valid_runtime?
+      self.runs = DEFAULT_RUNS.map { |r| r + runtime }
+    else
+      self.errors.add(:runtime, :not_valid_24h_time)
+      false
+    end
+  end
+
+  def valid_runtime?
+    runtime && runtime[/^([01]?[0-9]|2[0-3]):[0-5][0-9]$/]
+  end
 end
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 0653957..8305a70 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -1,23 +1,31 @@
 # Files in the config/locales directory are used for internationalization
 # and are automatically loaded by Rails. If you want to use locales other
 # than English, add the necessary files in this directory.
 #
 # To use the locales, use `I18n.t`:
 #
 #     I18n.t 'hello'
 #
 # In views, this is aliased to just `t`:
 #
 #     <%= t('hello') %>
 #
 # To use a different locale, set it with `I18n.locale`:
 #
 #     I18n.locale = :es
 #
 # This would use the information in config/locales/es.yml.
 #
 # To learn more, please read the Rails Internationalization guide
 # available at http://guides.rubyonrails.org/i18n.html.
 
 en:
   hello: "Hello world"
+
+  activerecord:
+    errors:
+      models:
+        schedule:
+          attributes:
+            runtime:
+              not_valid_24h_time: 'Not a valid time format, use HH:MM'