(e.g., in a 60-min meeting) than when it is higher (e.g., in a 30-min meeting). Our studies suggest this may occur due to ratio sensitivity: People infer that they have endured less after completing a smaller, rather than a larger, proportion of a mundane task, which reduces negative feelings. Data also showed that people lack insight into the impact of relative task completion and ruled out alternative explanations including response scale anchoring, progress focus, and preparation while suggesting mood regulation and attention as parallel explanations in some contexts. Finally, we identify busyness as a moderator and develop three low-cost interventions to manipulate perceived relative task completion and improve mundane experiences. (PsycInfo Database Record (c) 2025 APA, all rights reserved).