I found something interesting on the forum!

[libert19]

That's actually good find and not troublesome at all even if it's not exactly as it's name implies. It's good as infinity in scope of it's use case— we change devices, change browser, clear browser data, format or something else far many times before 6 years.

Or

Just login again, lol

[1714895576]

1714895576

[Sexylizzy2813]

OP I don't think is a big secret because I have come across such a thing, you can input any number of minutes on that box. When I first experienced it was when something went wrong while I was logging in but is really not a big deal, if you like you can input a longer minutes on that space bar.
But I don't think it will keep you to that number of minutes you have there, ones you're not active I think you'll be automatically logged out. 60 is the default minutes given, so is up to you to increase or decrease the number of minutes to be spent online.

[goxcraft]

OP, it's nothing new. It was always there. You just faced it the first time. I have faced it many times. One thing I didn't quite understand was why 3153600 minutes ~ 6 years I don't know if it's a random number or if it was intentionally put there. Or maybe it was something technical. I guess only theymos knows the real reason, as he did the coding and maintenance. Who would stay logged in for six years? Even for a moment, you have to log out and log back in. Sometimes a laptop or PC doesn't even last for six years. Lol. In these past few years, I have changed my device several times.

[shahzadafzal]

Well, I took my time to check this and what I got is a bit far from what you presumed, which means you are kind of mistaking about what you are saying. What I got was 2,190 days. I calculated it with this and that's what I get from the calculations.

However, in a year we have 365 days as a whole, but in a lip year we have 366 days and the results of what I checked give me 2,190 days in 3153600 minutes, which means after the 2,190 days have past, then the user will be automatically logged out from the site.
I don't know if am wrong but if I am please correct me.

Nope, you are wrong! I don't mean you're wrong in your calculation of converting 3,153,600 minutes into days, but you're incorrect about automatic logouts after 2,190 days.

A user will be automatically logged out from the site after exactly 1 year if they are inactive, accurate down to the millisecond when the session cookie expires.

In short, even if you check "Always stay logged in", you will be logged out of the site after 1 year of inactivity. However, if you use Bitcointalk during this time, the 1-year time period will keep extending indefinitely, and you will indeed 'Always stay logged in.

There may be a relation to the number of seconds in a year (31536000) for choosing 3153600, but I can’t see the logic behind the value for a minutes value.

Oh yeah it make sense... it looks like back in 2004 that one overwhelmed SMF developer tried to convert 31536000 seconds to minutes and did a lazy math (remember this is before ChatGPT or advance google) 31536000/60 = 31536000/60 and left he with 3153[6]00, hence 3153600

[EarnOnVictor]

It's good you know and update us even though it won't change anything as 3153600 minutes is a very long time. Some people would have gotten rid of their laptops before the time-lapse, so the developers knew what they did there.

And on second thought, it's "Always stay logged in" not Logged in forever, so it's still logically true as long as it serves its purpose for immediate and long-term use.

Come to think of it, 3153600 minutes is exactly 6 years...OMG!!! This is crazily way so long my friend.

[crwth]

So there's an interesting limit towards logging in, hmm. I don't think it matters that much but it's great to know. I think I have seen that as well when I typed in my wrong credentials.

Would there be something for you if you logged in for that exact amount? Maybe 1 BTC? 

[cabron]

Why were you logged out though?

One more interesting fact is that when you are also logged in on your mobile browser and then later you tend to logout. All other devices where you are logged in are also logged out. You would need to go back to the devices from your laptop, desktop, and phone browser. It would be good if Theymos could do something about it, maybe just logout to a particular browser, not all.