How Often Should I Change My Titles for A.B. Testing?

"I love A.B. testing, but maybe not how most people think about it," he says. "If a video is doing really well, I won't test it just because, you know, I don't want to mess with it." He adds that the best way to optimize your YouTube channel is by trying out different titles and thumbnails. 'It's like tactical, any gritty stuff? Yeah'