I make heavy use of the calendar complication on the Apple Watch (Infograph Modular). I use Google Calendar as the source of truth, sync those Google Calendars to the iPhone Calendar app, and then events from Google Calendar show up on the watch.
Unfortunately, when I add a new calendar entry in Google Calendar via the web app, it takes quite a long time to sync all the way to the watch. I'm not sure how long, but at least 30 minutes sometimes. When I notice that it hasn't synced, I can trigger a sync simply by opening the iPhone Calendar app on my phone. After waiting for a few seconds the iPhone calendar syncs, and then the watch face updates.
Ideally I'd like changes to the Google Calendar to propagate to the watch in a couple minutes at most, without me having to do anything. Is that possible?