Yes, I have used it before. It also doesn’t necessarily mean unsupervised, maybe I am just doing something else, like working in the office in another room, or cleaning or whatever.

You can usually configure the ntp setting on your phone yourself. Just set it to pool.ntp.org

To know what time it is?

Also some ovens can be programmed to start at a certain time. Say you have prepared the meal already but have things to do in the meantime and want it to be done cooking at dinnertime.