Could this be the reason why you've had the same PM for so long? I mean who knows how he used that information on his competitors, or the campaign funders of the competitors.
Benjamin Netanyahu has been PM for 7 years total (with 10 years in between the two terms) That’s shorter than George W. Bush was POTUS. David Ben-Gurion was PM for 13 years.
This is almost certainly not the case, given that the Likud under-performed heavily in the last elections, and was outmaneuvered politically by it's three main coalition partners/rivals.
He's the president of the main right-wing party. People like that often remain head of their state for very long once they're elected (first they're sworn in and then get more mandates to "finish their job"). Examples from my home country: Francois Mitterrand, Jacques Chirac. It may have something to do with this but you can get a way easier explanation.