Without going too deep into the complex nature of time, we can safely say that time flies - tempus fugit!

Therefore, inspired by informal representations of duration like this EveXL uses the [<- INTERVAL-ID ->] notation to apply conditions on interval durations. For instance, the following expression should be read as

• "TimeFlow" is an interval of time (line 1)
• Duration of TimeFlow interval is greater than or equal to 3 units of time (line 3)

We can compare interval durations. For example, the following expression means that:

• "short" is an interval of time during which the "color" sensor reads the value "red" (line 1)
• "long" is an interval of time during which the "color" sensor reads the value "blue" (line 2)
• the "short" interval is shorter than "long" (line 4)

This will match an interval of red readings shorter than another interval of blue readings.