diff --git app/models/mailer.rb app/models/mailer.rb
index 4bfa45b..b98ea6e 100644
--- app/models/mailer.rb
+++ app/models/mailer.rb
@@ -324,12 +324,16 @@ class Mailer < ActionMailer::Base
 
   # Sends reminders to issue assignees
   # Available options:
-  # * :days     => how many days in the future to remind about (defaults to 7)
-  # * :tracker  => id of tracker for filtering issues (defaults to all trackers)
-  # * :project  => id or identifier of project to process (defaults to all projects)
-  # * :users    => array of user/group ids who should be reminded
-  # * :version  => name of target version for filtering issues (defaults to none)
+  # * :days                     => how many days in the future to remind about (defaults to 7)
+  # * :tracker                  => id of tracker for filtering issues (defaults to all trackers)
+  # * :project                  => id or identifier of project to process (defaults to all projects)
+  # * :users                    => array of user/group ids who should be reminded
+  # * :version                  => name of target version for filtering issues (defaults to none)
+  # * :respect_nonworking_days  => if true the non working days setting will be used to calculate the date difference
   def self.reminders(options={})
+
+    extend Redmine::Utils::DateCalculation
+
     days = options[:days] || 7
     project = options[:project] ? Project.find(options[:project]) : nil
     tracker = options[:tracker] ? Tracker.find(options[:tracker]) : nil
@@ -339,6 +343,11 @@ class Mailer < ActionMailer::Base
     end
     user_ids = options[:users]
 
+    if options[:respect_nonworking_days]
+      working_day_count = working_days(Date.today, days.day.from_now.to_date)
+      days = days + (days - working_day_count)
+    end
+
     scope = Issue.open.where("#{Issue.table_name}.assigned_to_id IS NOT NULL" +
       " AND #{Project.table_name}.status = #{Project::STATUS_ACTIVE}" +
       " AND #{Issue.table_name}.due_date <= ?", days.day.from_now.to_date
diff --git lib/tasks/reminder.rake lib/tasks/reminder.rake
index 3807297..35dcfc6 100644
--- lib/tasks/reminder.rake
+++ lib/tasks/reminder.rake
@@ -37,6 +37,7 @@ namespace :redmine do
     options[:tracker] = ENV['tracker'].to_i if ENV['tracker']
     options[:users] = (ENV['users'] || '').split(',').each(&:strip!)
     options[:version] = ENV['version'] if ENV['version'] 
+    options[:respect_nonworking_days] = !!ENV['respect_nonworking_days']
 
     Mailer.with_synched_deliveries do
       Mailer.reminders(options)