The rusting process took about 3 days using the peroxide  vinegar  salt solution….Started almost immediately. Make sure to put planter on surface you don’t mind getting rust residue on, or on a tray of some kind as it will drip. Our driveway has rust runoff even 2 months later. 

The planters are beautiful though. Well made and solidheavy. Unique too as every piece turns out just a little different due to agingrusting process. I’d buy again.