Laws of UX
Parkinson's Law
Tasks expand to fill available time. Reduce form fields and you reduce completion time. Set clear expectations with time estimates. Constrained interfaces (character limits, deadlines) drive efficiency.
In plain terms
Work stretches to fill the time allowed — shorter forms and clear limits help people finish faster.
Why this matters
Long forms and open-ended tasks invite delay and abandonment. Trimming fields and setting clear expectations helps everyone finish, and shortens the path for users who find every field costly.