In the Steam store, is there any way to search for “short games”, e.g., games with an estimated completion time of less than 1 hour? I did not find such option in the advanced search link.
As DrFish mentioned, this is a feature that currently does not exist within Steam. However, if you’re willing to use external sources, I recommend taking a look at HowLongToBeat.com.
HowLongToBeat is a community driven site where players input their stats on how long it takes them to beat the story, side content, etc… across multiple platforms. The searching options allows you to filter down games by PC and the average number of hours it takes to play through the game.
Since it is community driven and outside of Steam, it may not have every game posted, but it’s useful nonetheless.
As Parrotmaster pointed out, it is good to take a note of the release date and number of reports given. When games are first released, it may take a couple of days or weeks to get accurate statistics due to players rushing through the game. Those who rush through the game tend to skew the results, making it seem like games are shorter than they really are.