why does it take long for the history to clear on chrome?

[Monster]

it takes as long as 10 minutes.

[Ike]

Viruses, slow computer, big files where history has not been deleted for a while. slow internet connection etc.

[Shirley]

The types of information that is automatically stored in browsers often include:
Temporary Internet files (web cache)
Cookies (information like preferences, from websites)
History (list of websites visited)
Form data (information typed into web forms)
This information is stored temporarily to speed up the browser and recall recently used information and settings.

Why clearing the browsing history becomes slow
As time goes on through the use of a browser, the number of items stored can potentially become large. Content-rich sites or sites with many images, in particular, can use a large amount of web cache. Additionally, a lengthy number of URLs in the web history list may be stored and a large amount of cookie data may be saved.

Ways to speed up the browsing history deletion process
Manually clearing browsing history at more frequent intervals can reduce the time it takes to clear it.
Alternatively, you can change the settings of the browser to remove temporary files every time you use the browser. Also, you can often specify that the browser keep a shorter list of information in the website history.

[CreaseCoder]

If you do not want to keep deleting your internet history, go Incognito (do Ctrl+Shift+N while in Google chrome).

[Jarett]

It's taking the time to clear every bit of un-needed data.