None of them can be considered real-time search results. Ran Geva posted an interesting article over at the Omgili blog which described a way to change the search parameters further to come close to real-time search results in Google. The default Google search result urls contain the qdr:x parameter if the results are filtered by time with x being replaced by d for days, we for weeks, m for months and y for years.

All he did was to replace the x value with n for minutes and s for seconds to get results that have been posted in the last 60 minutes or 60 seconds. It is furthermore possible to add a number behind the n or s value to customize the query further. The parameter qdr:n20 would search for results that have been indexed in the last 20 minutes.

The custom search parameter will be displayed as past minute or past second after performing the search and will persist even when conducing new Google searches. Seconds usually do not yield many results (if any at all) while minutes are usually well indexed already.

Steve Rubel acted quickly and created a bookmarklet to display the Google search results that have been indexed in the last ten minutes.

The bookmarklet can be changed easily to search a different time frame. All that needs to be done is to change the qdr=n10 part in the bookmarklet.