Yes I would say a minimum 4 weeks. But honestly it could be 6 months or even a year. When government entities spend a couple of million dollars or more they do their homework (nobody wants to lose their job/head by buying millions of dollars worth of junk).
A pilot gives them the opportunity to test the product under all circumstances and over extended periods of time ie: how does the battery perform after 6 months etc.
Good news is we have more orders coming so everything doesn't rest on the Israelis being swift to implement.