Why does my co worker have long conversations with me?

Because they are lonely and you seem a trustworthy person that they can talk to. It's actually a complement about you.

You do need to learn how to deflect the conversations to a more appropriate time. Can you just say that lets have this discussion later, tomorrow, etc as you are busy. but then you actually need to make time for that discussion later.

You might wish to check with HR and see if they have programs to assist people with social/mental issues (before they get extreme). Sounds like they need to be introduced to some outside activities the enjoy. Perhaps HR can assist in that.

If not, they can likely make a point to the other person that you are not their verbal garbage can and they need to control their talking to you on general non work issues.

I wish you well with this,

yes 100% norm some people are so lonely they will forget social etiquette but they get so starved for social interaction they drain the life out of the person that's not mean to them

they then mistake politeness for friendliness because everyone else treats them like shit because they wont shut the fuck up

more offen than now they make up huge unbelievable lies that are nearly impossible and are constantly one upping anything that is told to them

no mater what situation they did it more they did it bigger they did it faster and they did it best

When I’m done working, I sit at the bar and talk to my coworkers. Like literally every time. We talk the whole shift. Men and women.

That's the thing about work. We get stuck dealing with co-workers who are annoying. My job has co-workers in the breakroom that can't mind their own business about what a person is doing and co-workers who gossip and complain about each other behind their backs. XD

Are you female?

I don't want to seem rude, but some people do genuinely like to speak to their coworkers. A lot of people only really socialize at the workplace.

There's not really much more to it than they consider you a friend.