The popular line of thinking is that it’s not important to learn super-formal Japanese because you’re more likely to encounter informal Japanese and you would sound weird in that conversation if you speak keigo. But I was just in Japan and had zero personal conversations (everyone responded in varying levels of English) but heard a TON of baffling, super-formal Japanese at *every* business I entered. All I understood for three days was “mmmmm mmmm mmmm gozaimasu!” So spend time watch the videos about ‘what you’ll hear in a restaurant’ or convenience store or hotel check in, etc. It will come up more than you think.
by Ganbario