I don't know what a "few days" means. Maybe it means from tonight until Sunday. Or maybe longer.

I am a little surprised that Bibi was satisfied with that response. A few days? The lockdown is for two weeks, minimum. Maybe he figured he'll take what he can get for now, and try to extend it later when the "few days" is finished. 

I think that is a reasonable approach, from Netanyahu's perspective.  Arguing now might go nowhere, as two weeks or more of shutting the schools is too much - tafasta meruba lo tafasta - and Rav Chaim would not be expected to agree to such a thing. Demand, insist on, a two week commitment, and Rav Chaim might just say no. Get a little bit, and then get a little bit more....