Settings > Advanced > Export (at the very bottom)
If you have chats from 2017 you might have files that will get stuck and have to be manually skipped, but if you don't include any files and only include chats, it goes a lot faster.

Settings > Advanced > Export (at the very bottom)
If you have chats from 2017 you might have files that will get stuck and have to be manually skipped, but if you don't include any files and only include chats, it goes a lot faster.