I have found
https://omorashi.org/files/category/...ilter_key=free
It contains 46 pages of FREE dowloads, 20 per page (so nearly 1000 clips to browse through). I'm currently downloading a very large file and will tell you how it works out. Note that browsing through the videos, it doesn't say anything about how long they are, so you'll have to work that bit out for yourselves.