I deleted some of albums but I noticed that they still appear in search results
see. http://jalbum.net/fi/search/albums/arit , album 1943 - 2002 is removed
but cover photo is shown even though link is not working (Album not found).
How can I permanently remove the albums so that even their cover photo thumbnail is not shown at all?
Does anybody know for sure how long the delay actually is?
No. Not even me who programmed it. The search index is updated every 8 hours, so it shouldn't take longer than that. But exactly when that happens is not possible to say. And it differs between servers, so reloading the page might give a different result.