I see your minecraft calculator and raise you a minecraft GRAPHING calculator.
I've been accused of having too much time on my hands. Though in college, a friend of mine named Joe Brown built a 6 foot wide clock completely out of wood, gears and all. He designed these on paper and cut everything by hand using only a bandsaw. No CNC, no Solidworks.
Here's the "big" clock. The outermost dial and largest hand indicate the day of the year (in other words, the hand completes one sweep every 365 days. It's mesmerizing to watch.)
He also built several smaller, wall-hanging units, such as this one:
Now, Joe didn't sell these clocks. He'd occasionally give the smaller ones away, but for the most part he tended to just accumulate them in the way that Eleanor Abernathy (the Crazy Cat Lady from The Simpsons) tends to accumulate cats.
Generally speaking, I've tended to use this as my fixed datum for how much free time a person has on their hands, supposing that the amount of free time required to build 6 foot diameter clocks entirely out of wood for no particularly good reason represented 1 FU (Freetime Unit), and that the amount of free time which any other human (other than those incarcerated for life in solitary confinement) possessed would be measured in centiFUs or milliFUs.
Thanks to you, Bryce, I now have to recalibrate my entire system of thinking in this regard. It's like when the Danish astronomer Ole Roemer finally provided, in 1676, the first clearcut proof that light takes time to move from one point to another and provided a reasonable estimate of its speed. That changed everything.
I mean, just thing for a moment what would have happened if Charles Babbage had had access to both a copy of Minecraft and a bored Swedish teenager! For starters, he wouldn't have died penniless and surrounded by vindictive organ-grinders. But beyond that, we'd probably all have flying cars and travel on FTL-capable ships to our vacation home on Gliese 667 Cc (an earth-like mesoplanet located in the Scorpius constellation.)