[exim] GreyListing

I am using this greylisting implementation.

http://wiki.exim.org/DbLessGreyListingRun

Works great. I want to extend the defer period for IP's that fail
"verify = reverse_host_lookup" from 3 minutes too an hour. How would
I do that?

I am guessing:

defer log_message = greylisted
!verify = reverse_host_lookup

Adding the !verify right under the defer?

Then having another defer without the !verify afterwards with the
normal 3 minutes?