From mboxrd@z Thu Jan  1 00:00:00 1970
From: M.P. <mattia.pascal@gmail.com>
Subject: compute the difference between effort estimates and actual clocked
 time
Date: Sun, 31 Jul 2011 09:10:51 +0000 (UTC)
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I'd like to add to my tasks a property  whose value should be the difference in
time between the effort estimates and the actual clocked time. The final purpose
is to use the property in column view mode as I do with CLOCKSUM and Effort.
Could you give me any hints?