I am having this issue, sometimes the download is 10 minutes, other times it's hours. I've had the estimate jump up to 24+ hours for just a 2gb video.
How long has this been going on for you?
Sorry for the late reply! It's been happening for quite awhile now. I wanna say at least two months. I try every few days to see if it'll work properly or not. and similar to Mortimer, I don't use adblock here or anything of the sort, and sometimes it downloads fast and then just drops to much slower speeds towards the end