This dataset includes the quantitative data of the usage during the evaluation phase of a prototype web-based federated search engine for art and cultural heritage related content. The metrics which resulted in the dataset were in the form of a timeline of actions taken from a user (evaluator) in the course of a single session of interaction with the platform. A total of 20 different metrics were being monitored regarding the usage of the search engine, including submitting a query, a voice query, preforming a visual search, viewing a result, viewing a visual search result, updating an avatar, editing a user profile or changing user preferences, bookmarking and removing bookmarks of results and visual search results, using text to speech of all the various elements, opening the source view of a result and clicking a concept tag. All metrics included the timestamp of the event taking place and the value of the related event (e.g. the term of a search query).