How much time should a startup spend on marketing?

Here’s what I’ve learned in the last 3 months: when you’re busy doing work that matters, it’s easy to forget to talk about it. We’ve been so focused on building our product that help people and crafting experiences that resonate that we’ve overlooked the power of sharing our journey. But stories matter!!! When we don’t share our milestones, we miss the chance to inspire, connect, and remind others why the work we do is important. Moving forward, I’m committing to sharing more—not for applause, but because the world needs to see what’s possible when you care enough to create something meaningful.

Early on, your product is your priority, but as soon as you’ve got a solid offering, marketing should be a constant. You also need to be shipping new features, etc, so I'd say set a marketing / revenue goal, and stick to it