When To Flush (DWC)

So I Run A Simple Non Recirculating DWC System And I Want To Know When I Should Flush. I've Got Two Weeks Left Before Its 10 Weeks!!! Should I Start Now!?

flushing the last week, maybe switching out with clean water twice.. would be plenty for a dwc.

some people don't flush, but just run lighter nutes for the last week.

The last week is the only time I do flush, and even then it isn't really a flush, just removing some water and replacing with fresh to lower the nute concentration. I know a lot of growers who never do that, just keep adding water and nutes.