Depends on your service. 20 second downtime on loading HN? Nobody cares. 20 second downtime on the last play of the Super Bowl - big problems.

For most internet consumers we’re accustomed to poor service so if a page doesn’t load we’ll assume it’s a local problem and try again 20 seconds later, same with buffering, it’s just something that happens occasionally. This is increasing the case for phone calls too. Legacy live tv and radio going silent though is still a major issue, especially on live events.