Frequency of changesets upload

How often does the app upload the changes? It seems to me that it doesn't do it instantly but rather after hours or days, grouping everything you modified together in a single changeset

Edit: I tested it a bit and I realised that I had the mobile data off for CoMaps, which made the app keep everything in the cache until I connected to a WiFi. So, if connected to the internet, it creates a changeset with each edit that it then uploads within a second.