Your first comment belongs to fantasy land rather than reality. 6 months to miniaturise a warhead and test it, maybe. You clearly have very little understanding of Iran's centrifuge constraints or pace of enrichment.If Nuke deterrent is the purpose, then Iran could assemble 100 100K+ ton warhead in 6 months or less
Lastly, the idea that Israeli destruction requires 5-10 warheads is a wildly inflated figure, a single 100-200K ton warhead will end it for good.
I said 5-10 instead of 1 to account for 1) first/second strike capability, 2) missile failure and 3) missile interceptions.