@Caroline_Ardmoor Yes, setting up 301 redirects for these blogs is a good practice, as it helps preserve the SEO value that these pages might have accumulated over time. This is particularly important if the blogs have backlinks or still receive substantial traffic.
You should redirect these old blog posts to the most relevant new content or product pages. If no such relevant page exists, you could direct users to a related category page or to your homepage.
As for the duration, 301 signifies a 'permanent' redirect, so you should ideally keep them in place indefinitely. However, in practice, after around a year or so, most of the link equity (the SEO value of links) will have transferred to the new page. Still, if old links to the page exist on other sites or in bookmarks, you'll want to keep the redirect in place to ensure users don't hit a dead end.