There are a number of variables which affect how long Intruder's trial scans will take to complete. However, this article should give you an idea of when you can expect your vulnerability scanning results to be published.
On average, Intruder's trial scans (based on a client which has entered one target to scan) will take in the region of 1-3 hours to complete. Adding all 3 targets for your trial scan may take longer.
However, in some rare cases, certain websites (depending on their size, response times, and the types ...) can cause scans to take significantly longer than this. If you're concerned that your scan is long-running, please don't hesitate to contact us in-app and we'll give you an update.