Hello, I used a template that auto adds google ads. All we have to do is add publisher ID and google_ad_slot ID. First I added publisher ID only for few hours and all pages displayed ads all times. But now I created an ad slot and added google_ad_slot ID also. Now it only shows ad less times and most of the times blank space. Note : Ad is created only around 10 mins ago. But I do not know how google_ad_slot ID changes the ads availability. Can some one please help.
You answered your own question. On low traffic sites or newer sites it can take from minutes to a couple of hours for the Google Bot to crawl your site and display ads.