A/B testing, that's a good way to think about it, thanks. Here's another rule of thumb: try to quit at a reasonable milestone. Did you accomplish something you

A/B testing, that's a good way to think about it, thanks. Here's another rule of thumb: try to quit at a reasonable milestone. Did you accomplish something you can put on your resume? Write down what you learned. Are there any open questions that you could answer with just a few hours or days of effort? Do you have a story you can tell friends over dinner? All these are milestones of various magnitudes that you can feel good about to various extents. But yeah, in general there's no perfect test.