Yeah, it is too big of a jump. It is there so people can get to the end of the game without grinding through the 80 years if they just want to experience the end of it.
I should have put extra months speed and then years. But you don't have to use the speed-up; that's why you can change it to a lower one and just use it to get a boost of hours (in case you didn't get enough by skipping too quickly) ;p
And the game could use endless mode, I think or rebalance some of the hourglass costs, as there aren't enough hours to get everything, but you can achieve one of the different endgame builds based on which one you do focus on, and all of them do go through the years very quickly.