Maximum TCP connection duration generally or in java?

Question

Is there a maximum TCP connection duration or is it okey to keep such a TCP connection open for several days? (Of course with keep alive packets)

And especially: Is there such a connection duration limit in Java's TCP Socket and SocketServer?

Answer 1

Is there a maximum TCP connection duration

Not unless a router enforces one, but they do.

or is it okey to keep such a TCP connection open for several days? (Of course with keep alive packets)

You can try. Good luck. It isn't likely to succeed, and you shouldn't rely on it.

And especially: Is there such a connection duration limit in Java's TCP Socket and SocketServer?

No.