How to make the intro post snippets on your main blog feed longer

Very easy to do. Go into the HTML editor and find this piece of code:

<div class='resumo'>
 <span><data:post.snippet/>
</span>
</div>

Replace what I made black with what is below and put in your own value instead of the 230 that I have (although 200 - 250 does seem to be a fair length - but also be aware that with some themes you need to make it as long as 450 to get it to work):

<b:eval expr='snippet(data:post.body, {length: 230, linebreaks: false, links: false})' />

Note: Although "resumo" appears to be the most common term, sometimes instead of that you may have "summary" or "snippet". So, if resumo offers no results, then also look for those.