I thought I would share this tip on how to update calendar refresh time. The default is way too long (a week i think?).
SSH into nextbox, then
sudo - s
docker exec -it -u www-data nextbox-compose_app_1 /var/www/html/occ config:app:set dav calendarSubscriptionRefreshRate --value “PT5M”
The php code for time means Period Time 5 Minutes. You can change this to anything you need.