isolation box

I've had a Solan Wrasse in a 120g for a few months. I got a Xmas Red-lined Wrasse and a Blue Side Fairy Wrasse. The Solan chased the Blue all over the tank. Ignored Xmas. I put Blue in isolation box. Solan still aggressively attacks box Blue is in. It's been 5 days. How long does it usually take...