I built an audience a long time ago so visitors mostly find the blog via SEO and then sign up for the app. In term of time, these days it’s probably 30% coding, 60% marketing, 10% admin/customer support.
The marketing time is mostly testing new sales page versions, running A/B tests etc.
But I also sometimes have periods when I spend much more time coding. The next few months will probably be 80% coding while I create a mobile app.