Implement max_duration and min_duration filters for events
Implement max_duration and min_duration filters for events

aapris/linkedevents,tuomas777/linkedevents,tuomas777/linkedevents,kooditiimi/linkedevents,tuomas777/linkedevents,City-of-Helsinki/linkedevents,kooditiimi/linkedevents,aapris/linkedevents,kooditiimi/linkedevents,City-of-Helsinki/linkedevents,kooditiimi/linkedevents,City-of-Helsinki/linkedevents,aapris/linkedevents