Shortcut for estimated time using Keyboard Maestro (and Apple Script)?

OmniFocus OmniFocus for Mac
#1

I would want to be able to quickly add estimated time in OF2.

How do I do it? I don’t have much knowledge on Apple Script.

#2

[Updated/edited]
Post author already knows this, but FYI for others who are looking for answers for this sort of thing: There is info at this thread: The ways to use Estimated Time in OmniFocus 2 ▸ Tips & Discussion
But note that one of the links in the first message of the thread is now broken. There’s an updated link provided lower down in the thread. The updated link is https://drive.google.com/folderview?id=0B7rFojKU0he8OWRMd1d3cks4VlE&usp=drive_web&ddrp=1
happy OF’ing!