How long should I wait before Google deindexes my pages?
For your pages to disappear from Google's index, its robot (GoogleBot) must visit the page or pages you have set to noIndex.
GoogleBot's visit frequency and the number of pages it visits during each visit vary from site to site.
On the most popular sites, GoogleBot may visit several times a day, whereas on less known sites, it may only visit once a month (or less).
Therefore, it is not possible to tell you precisely when your pages will be deindexed by Google.