Add Time left and Time estimated to correspondence

[goricr]

Hi,

I would like to add Time left and Time estimated fields to correspondence (reply, comment) but dont know how to do that…? I would also like to rename these fields to something else…

I tried this extension but it only adds custom fieds:

RT::Extension::CustomFieldsOnUpdate - edit ticket's custom fields on...

I am using RT 5.0.1.

Thank you