That presupposes we have 1,000, trustworthy agents (or even military intelligence types)that understand Arabic sufficiently to be reliable translators and with enough analysis ability to spot the "good stuff" as they listened to and translated the stuff.
okay, let's play with the numbers.
1000 agents take 3 hours (each, I assume)='s 3000 hours
OR
10 agents 300 hours each ='s 3000 hours (7.5 weeks each)
Doesn't seem to daunting or unreasonable in the name of National security - and they had 4 years