I've never heard 120 years mentioned from the platform in relation to the last days. I am not saying that the thought has not crossed individuals' minds nor that the perpetuation of thoughts about this would not suit the WTS but I simply reiterate what I said earlier:
1 - the last time I can see anything in writing about this was 2010
2 - at the time they were at pains to stress Noah preached maybe only 40-50 years
3 - no association with the last days was made
4 - this is not a topic of conversation I have ever come across and I do my fair share of "seeding" of conversations to see what people are prepared to say
5 - it may escalate as a thought over the coming years as people latch onto something to explain failed expectations but I do not expect any official sanction through RC talks or WT articles
Right now, as far as I can tell, the only people buzzing about this thought are on boards like this.