Google confirms bug with crawl stats in ‘time spent downloading a page’ Search Console report
No need to worry, the Google Search Console crawl stats drop last week was indeed a bug.

Google’s webmaster trends analyst John Mueller has confirmed on Twitter that there is a reporting glitch with the crawl stats “time spent downloading a page” report in the Google Search Console for the dates February 20 and 21.
There was a massive dip in the number being reported on those two days, but that dip was just a glitch in the reporting. It does not reflect actual crawling or search rankings.
Here is a screen shot that illustrates the glitch:

Mueller wrote:
If you’re seeing a weird drop in the Crawl Stats in Search Console for a day last week, that’s a reporting issue on our side which you can ignore. Sorry for the confusion & hope your week otherwise starts off great!
Here is the tweet:
We're listening.
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