I have recently started Dark and Darker this week! I keep hearing about a wipe, is that supposed to happen on September 1st? How long does a wipe last?

also:
Selling Gold Bag 50fg

No one knows exact date for wipe (yet), but in past it happened within one to two weeks after season end timer reached zero.
They used those last few weeks to push out some drastic balance changes or test new things out.
Each wipe is around 3 months long but they have said they are trying to keep them little shorter than that in future.
No point to wipe if there is not enough new content for next season I assume.

The 6th

Very very good to know. I didnt know any of this. Thank you for the helpful info as a new player!