In a world where time travel is not only possible but also encouraged, the One-Minute Rule is the foundation upon which all other rules are built. It states that any journey through time must last at least one minute, or the fabric of reality becomes irreparably damaged.
Breaking this rule results in the creation of temporal paradoxes, which are best described as 'interesting' events that occur when two or more events in the timeline collide and create a singularity of confusion.
So, if you're planning to travel through time, make sure to plan for at least one minute of pure, unadulterated awesomeness.
For further reading, please see:
Time Traveling and the Law Chronal Accordance: A Guide to Not Getting Lost in Time