You will get one toast indicating that it will be deleted, and one a second or two later indicating that it got deleted.
If you delete multiple comments quickly one after another, you'll first get a bunch of toasts indicating that the comment will be deleted, and then, with that second or two delay, each confirmation, but they do get deleted sequentially, so you have to wait for all the confirmation toasts. Which for a deletion of 10 comments will take more than 10 seconds, even if you clicked them all in two or 3 seconds.
Go to https://www.youtube.com/feed/history and click "Comments" on the right side. Then delete one comment.
You will get one toast indicating that it will be deleted, and one a second or two later indicating that it got deleted.
If you delete multiple comments quickly one after another, you'll first get a bunch of toasts indicating that the comment will be deleted, and then, with that second or two delay, each confirmation, but they do get deleted sequentially, so you have to wait for all the confirmation toasts. Which for a deletion of 10 comments will take more than 10 seconds, even if you clicked them all in two or 3 seconds.
Same with the live comments at
https://myactivity.google.com/page?page=youtube_live_chat&co...