After some research and reflection I've changed the keywords for a couple of my sites. How long does it usually take for those to filter into SEO results? Days, weeks, months?
this really depends on your website and search engine. If your website update often and have high PR, changes will appear in 3-4 days. If your website is weak and update once a 3 months, it can take more than 2 weeks.
SEO results - if you are referring to the SERPs it can take from 1 month to 6 months for something you do today.