duration
property of the FILTER object (an element of the collection of the FILTERS tag), sets the duration of the process of changing the state of a dynamic filter in milliseconds. Many tags can have a collection of filters.

1. task from scripts:
object.filters (filter_number) .duration = 1
2. setting in the tag (in the STYLE attribute, in the FILTER property):
duration = 1
For more details with examples, see the FILTER property.