So after big thinking i finally found out when i started playing. And my best calculation is: 2nd half / end of 2012.
How do I know this?
> End of summer 2012: Beta 1.7 debute (that was my first version i played on) and I clearly remember I was most active in the Minecraft Youtube (I subbed for most of the OG Minecraft channels that time) in the middle of 2013.
> I also remember playing 1.4.7 (what was the version what i the longest played)
> I also remember switch to 1.5.(something) because my favourite Minecraft server was in that version
> I also remember switching to 1.12.2 because of the same reason.
So if I remember well, i played the most in 1,4,7 because one of my favourite Hungarian creator made her playtrough in that, and i played in the same time as her.
So, if i calculate I first got my hands on the game in the 2nd half/end of 2012, that mean I play this game for over 9 years.
That mean if I just! played 1 hour each day, I played 3800 hour. (And yeah I played more, bc i remember playing 5 hour, when me and 2 friends was on a server in 1.4.7)
So if we calulate with a daily 3 hour avarage (what isnt that impossible) that is 9855 hour
Maybe a bit more, maybe a bit less bc xmas, summer holyday, exams etc
i would say between 9-10k HOUR!
Sorry for my garbage english, i am not that good in it.
I actually have the stats for most of the worlds that I've played on (including the worlds themselves), which total over 7,400 hours since early 2013 (about 8 1/2 years ago):
World1 165.80 days 3979.20 hours 1129 sessions (3.52 hours/session)
TMCWv1 (replayed*) 42.56 days 1021.44 hours 284 sessions (3.59 hours/session)
TMCWv4 38.95 days 934.80 hours 243 sessions (3.85 hours/session)
TMCWv3 15.83 days 379.92 hours 104 sessions (3.65 hours/session)
InfiniteCaves (recreation) 15.62 days 374.96 hours 122 sessions (3.07 hours/session)
World1v2 8.57 days 205.68 hours 73 sessions (2.82 hours/session)
TripleHeightTerrain 8.25 days 198.00 hours 53 sessions (3.74 hours/session)
World1v3 7.27 days 174.48 hours 59 sessions (3.08 hours/session)
TMCWv2 5.62 days 134.88 hours 52 sessions (2.59 hours/session)
Total 308.47 days 7403.28 hours 2119 sessions (3.49 hours/session)
*TMCWv1 (original) 14.72 days 353.28 hours 103 sessions (3.43 hours/session)
(replayed started from 11.32 days / 83 sessions)
These are the current stats for World1, my first world, which I play on between periods spent on other worlds and mod development; I do not AFK for any reason so the time accurately represents my playtime (likewise, mob kills mostly represents natural mob spawning as I do not use mob farms, or kill farm animals other than around 200 chickens per repair of my sword (using a slightly worn sword is necessary for it to cost less than 40 levels under the pre-1.8 repair system), which gets around 3124 mob kills; my playstyle revolves around caving for fun):
I've had several other worlds not listed, mainly very early on; one was a Survival Island world (seed "Notchiswithus" in 1.5.1, or up to 1.6.4, Large Biomes. Interestingly, the only source for this seed on Google other than my own posts is a YouTube video from March 2013 which still has less than 2000 views, which must have been where I found it), another was a custom map called "Stratosphere Survival", plus a few minor worlds, such as one where I explored the (then) largest known cave system, which I found with a search program I made, as well a copy of my first world I modded with my own mod, TMCW (I do still use mods on this world but not terrain/biome altering mods like TMCW, thus I refer to it as "vanilla").
You may note the footnote for TMCWv1; this is because I'd originally deleted many of my old worlds but when I later came across an old backup I decided to keep them, including TMCWv1, which had not been backed up after I'd stopped playing on it, thus I lost several days of progress, and I decided to play on it again at least until I'd played on it as much as before (which turned out to be far more), so the total playtime on this world is really 45.96 days. Likewise, InfiniteCaves was completely recreated from scratch as it had no known backup kept (this was my first truly modded world with 2x the vanilla 1.6.4 cave generation and "amethyst armor/tools" and "backpack" mods), with the original world having around 7 days of playtime, which together adds around 10.4 days of playtime to the total.
In terms of yearly playtime, 2017 likely has the most playtime of any year that I've been playing, with 52.82 days (1267.68 hours) spent playing nearly every day, mainly since I spent very little time on mod development (this year has been the opposite, with most of the year so far spent on mod development; however, I do not consider this to have not been playing with the game, just not "normal" Survival world gameplay, so this easily adds another thousand hours or more to my total "Minecraft time").
Also, here are renderings of all of the worlds I have; except for World1 all of them are modded, first with changes to the underground (more/bigger caves/deeper ground), then to overall world generation (TMCW); the worlds named "World1v#" all used the same seed but had a different underground, as did InfiniteCaves (Large Biomes with spawn point manually changed) and TMCWv1 (only the general land/ocean map is the same):
Wow. That's pretty good. I wish that I were that consistent with my gameplay... while Minecraft's my primary game, I take frequent "hiatuses" from it, and whatever statistics I have are pretty lacking. I've been playing since 2013... if I had to guess, I've probably put around 1500 hours in the game, assuming I play around 4 hours a week, for 8 years. I guarantee it's probably more than that.
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I post pretty rarely nowadays. Gosh, I wish this place weren't so... empty...
Tallying up the playtime from the worlds on my current computer comes out to ~2000 hours. I've had it since around 2017 and I started playing sometime around 2012 or 2013 so I'd say a low estimate of total time would be double that, 4000 hours.
I do feel like I used to play minecraft a lot more than I do now though and, unlike some people, I've lost a lot of my old worlds, so could be as high as 6000 I'd say.