First account total online time is 7527d 21h 19m.
From Aug 14, 2018 to Today=7527 days.
How it is possible?
What type of Bitcoin ID it is?
They are probably parsing forum pages and sending so many requests with multiple devices.
Here are two threads discussing about this issue. (There are probably more topics.)
The forum stats are wrong! @theymos check it out,please.
"Total time logged in" bug and accounts with long time logged in
Below is the post Theymos made that time regarding disabling some features.
Alex_Sr has provided some unofficial stats for new users per month. It has been updated until January 2020. (Visit the link below)
Statistics of user registrations on Bitcointalk 2017-2020