This is Redmine plugin for multiple estimate entries for a single task
git clone https://github.com/nmikhno/redmine_estimates.git
The plugin requires a migration, run the following command in #{RAILS_ROOT} to upgrade your database (make a db backup before).
For Redmine 2.x:
bundle exec rake redmine:plugins:migrate RAILS_ENV=production
Restart Redmine
You should now be able to see the plugin list in Administration -> Plugins and configure the newly installed plugin.
Now you shold be able to add and manage issues estimates.
Check out some permission for user's roles.
View issues report with total estimates and total accepted estimates hours