Three years, so not as long as some other places.
To be fair, probably not that influenced by Russia. The problem is that Netanyahu is, while being a complete narcissist, a very smart strategist - and he will do whatever it takes to be and stay Prime Minister (particularly as he is being pursued for corruption charges, and has some level of immunity if Prime Minister - note by the way that while some of these relate to money, and those relating to his wife primarily do, the rest not so much, more of them relate to buying influence with newspapers etc, I'd say he is more interested in power than money, although power gives you the ability to dish out largesse). And he manipulated the system very effectively by welding three lunatic right wing parties together so that together they got over the threshold, so he then had enough votes to form a majority. Each one of these three is horrible, but in different ways, one of them is specifically anti LGTBQ, and only has one member in Knesset, and would never have gotten in if that party hadn't been part of this three part joined party that Netanyahu constructed. And the left wing parties didn't unite like this, so a number of votes were lost because people voted for parties that didn't get over the threshold. Whether the fact that the parties opposed to Netanyahu didn't unite was due to Russian influence, I suppose it is possible, but I think they were just ideological enough and the differences between them felt significant enough to them that they wanted to run independently, but it was a bad, bad mistake.
But now Netanyahu has to govern with these horrible coalition partners, plus the ultra orthodox religious parties (not that they are so nice either, but they just want control of housing as there is a desparate shortage for their growing population and money for their yeshivot and to keep their boys out of the army and in yeshiva and away from secular subjects that could mean they could be productive earners in the future, they traditionally don't care about foreign policy or even much domestic policy beyond that) who all give him his majority (if pretty much any of them walk, his government falls - as he has 63 in the Knesset out of 120). So the right wing three parties that got in as one have an enormous amount of power, even though there are only six of them. And they are real ideologues, so not for turning.