I have recently been going through our webmaster tools to try and boost our SEO to what it use to be. I saw that we had a lot of duplicate title tags and also Google was crawling our sort pages (so it was classing it as duplicate content). I have since addressed all these problems but webmaster tools still says that those problems exists. So i was just wondering if there is a time i should wait before becoming nervous that my fixes haven't work or does google just do it in their own time? 
How long does it take for webmaster tools to update
seo;google search console
Google notoriously takes it's own time to update the webmaster. You can do some things to try and make the changes go through a little quicker such as using the fetch as Google tool or submitting pages through the URL submit tool but in my experience changes can take a month to process properly through the webmaster, if not longer.