As far as google crawling and de-indexing all of the pages with the noindex tag, is that a time consuming process before all of the pages are removed?

If you have a site with a few thousand high quality and authoritative pages, and tens of thousands with search results and tags pages with thin content, and noindex,follow the thin content pages all at once, will google see this is a good or bad thing?

I am only trying to do what Google guidelines suggest, but since I have so many pages index on my site, will throwing the noindex tag on ~80% of thin content pages negatively impact my site?