Time on Task (ToT)

Time on Task (ToT) measures the amount of time a user spends completing a specific task. It is an important usability metric that helps evaluate the efficiency of a design. A shorter time on task generally indicates a more efficient interface, while longer times may suggest that users are struggling to complete their goals, potentially due to confusion or design inefficiencies.

Time on task is most valuable as a comparative metric — comparing across user segments (new vs. experienced users), across design iterations (v1 vs. v2 of a flow), or against a competitor's product. Absolute numbers rarely matter; what matters is whether your design is faster or slower than alternatives. For B2B SaaS sold on productivity, demonstrating that your product reduces time on task by X% compared to the incumbent is a compelling quantitative sales argument.

Linear measured time-on-task for common workflows (creating an issue, updating status, searching across projects) and benchmarked them against Jira — finding they were consistently 3-5x faster. This data became a central part of their competitive positioning and sales narrative.