YouTube removed the ‘Last Hour’ filter to stop people from tracking live events. Here is the workaround.

by

So lets say you wanted to search for “example” hit enter the URL would say
https://www.youtube.com/results?search_query=example
Add string &sp=EgIIAQ%253D%253D so it now says
https://www.youtube.com/results?search_query=example&sp=EgIIAQ%253D%253D
Hit enter.

h/t a_human-being