Min and max duration indicate the minimum and maximum amount of time there is between 2 timepoints. For example, if you have

(timeConstraint tp2 tp3 160 160)

this means that the time between tp2 and tp3 timepoints has to be exactly 160 seconds. In other words, tp3 has to be fired exactly 160 seconds after tp2 is done.

While
(timeConstraint tp3 tp4 0 30)

means that the time between tp3 and tp4 can be between 0 and 30 seconds. In other words, tp4 can be fired up to 30 seconds after tp3 is done.