[exim] test $message_age

Hi,

I have this router in a test exim setup.
etrn_delay:
driver = accept
transport = smtp_appendfile
condition = ${if >{$message_age} {3600} {yes} {no}}
domains = +etrn_domains

How can I test a queue run with a message_age of 3601 without actually
touching the real queue sitting on the machine?

-John