A4A Course times are based on expected base rates of travel for each level and course type. See the rates of travel in the table extracted from Section A-2 of the rule book!
No need to worry, computers are good at that type of thing. Once the course length is put in, this comes up for the judge - no need for a calculator or sheets of tables. The system doesn't allow times outside of this range either - one less thing for the judge to think about, and competitors can always know what to expect.
Our intention with these course times is to always celebrate clean, focused runs with a clear round - so even steadier dogs can progress and always find a fun challenge building skills at competition
What does this translate to on a course? See below for the minimum allowed course times for a range of course lengths.