I don't know about Apple watches, but I do something kind of like this on my Android phone using Tasker. I have it toggle airplane mode for 55 minutes at a time

I don't know about Apple watches, but I do something kind of like this on my Android phone using Tasker. I have it toggle airplane mode for 55 minutes at a time, "waking up" for 5 minutes every hour to send and receive messages. Operating in this mode reduces my digital footprint and has a fantastic effect on battery life, but it's kind of a drag for people who want to call me. My dream phone would have a built in one-way pager radio to alert me of incoming calls and would only connect to the cellular network if I chose to accept the call.