That's pretty impressive considering that I'll have been playing the game for 5 years in a few months, and have been playing it pretty much the same way since I started playing, and all in singleplayer. Not only that, that was pretty much all the time I spent playing video games, aside from a few hours spent on some browser-based games - and I see no indications of myself getting tired of the game yet or any other game catching my attention the way Minecraft has.
Also, this time seems oddly specific but there is a good reason for that; I spent the first few days of the year finishing up a mod and I did not spend any time actually playing since late 2016 (I don't count this as not doing something Minecraft-related though), then spent 22.46 days (per the in-game stats) playing a modded world, followed by 30.36 days on my first world, for which I had statistics from the last time I stopped playing on the world, at which point I had 102.37 days of playtime, now 132.73 days:
Final statistics for TMCWv4:
Statistics for World1 from late 2016:
Statistics for World1 at the end of 2017:
Also, you can see that I spent a total of 347 sessions playing, 140 in TMCWv4 and 207 in my first world, or one for all but 18 days of the year; the average time per session was 3.65 hours / 219 minutes, or 3.47 hours / 208 minutes per day. Much of the missing days were spent on mods, which again I don't really count as not playing / doing anything with the game, and also contributed some additional time on days when I played. Note that I do not AFK for any reason so this accurately represents how much time I've actually spent playing.
If you extrapolate the time I spent playing in 2017 to the total time since I bought the game my total playtime is around 251 days - or more than two-thirds of a year, more than half of which has been spent in a single world (this time is even longer when counting the time I spent playing on a copy modded with a version of TMCW).
Also, here are maps of the worlds I played on in 2017, first before and after renderings of my first world, with my modded world below; my first world is now over half a gigabyte in size and measures 6656 x 6576 blocks. For another sense of scale, the little dot to the left of the explored caves in the second world is a stronghold:
In addition, if you look at the latest statistics for my first world you may notice that I've traveled more than 1,000 km by minecart, which I achieved on the very last day of the year after returning to my main base to store away resources I collected - a truly impressive distance for a form of transportation that is increasingly ignored these days - and is still the only form of transportation that I use besides walking and boats; I don't even use the Nether for its 8:1 distance scaling. Railways have several advantages over horses and elytra when you are traveling between fixed points though, such as not having to control them other than starting and/or transferring between minecarts, or not worrying about mobs at night, or rugged terrain; they are a bit expensive but when you've taken more than 150,000 rails from mineshafts and mined enough iron to make well over a million more that is like saying a dollar is expensive when you are a millionaire.
Here is a map of my first world with railways highlighted and bases marked (MB is my main base while secondary bases are numbered in the order they were built); the total length of my rail system is 15872 blocks (15279 regular and 593 powered rails, as measured with MCEdit), with the base I am currently at (the northernmost base) being about 3035 blocks from my main base by rail (this part of the rail system is more irregular and is among the oldest part; prior to returning to my main base I'd traveled 999.80 km, or 6.07 km less than after I returned to my secondary base. The longest round-trip distance from my main base is 7.74 km, to base #18):
I hate to be 'that guy' but you post about this in almost every thread slightly relevant to caving and mining.
So, why was this thread worth making? I promise I'm not being a meanie-face, but you let everyone know about your marvelous 1.6.4 caving stats more often than any one person should.
Really? I only mentioned the world "cave" once in this thread, in reference to some maps of the worlds I played on to show what I did over the year ("For another sense of scale, the little dot to the left of the explored caves in the second world is a stronghold"), and what else should I have mentioned when I literally do nothing but cave? The few meager "builds" I made? If you don't like my threads just do do not read them or ignore me, just like I told the last person to complain about this (some even have the nerve to suggest that I change my playstyle to building and redstone or build auto farms - no, I'm never going to change my playstyle unless I decide to, and I have nothing to lose, unlike, say, a YouTuber who depends on views for income).
Also, I mention the time spent playing partly to make a counterpoint to all the "Minecraft is dying!" threads, specifically, the ones where the OP says that they and/or their friends have gotten bored of the game - for every person who says that there is another who plays as much as ever, and my playtlme isn't even high by some standards (on these forums somebody has a world with over 11,000 in-game days or 152.8 days of playtime (minus any sleeping to skip nights, it still has around 2,000 more days than my first world), and somebody on Reddit recently said they had over 9,000 hours of playtime).