I am going to be completely honest.
Infinityfree is a free hosting service. But the speed of loading assets is really slow.
I remember setting up my site for first time. And fonts and images wouldn’t even load. On anything. Sometimes they would, sometimes they wont. Problem wasn’t my internet connection.
So I ended up using https://fonts.google.com and https://imgbb.com for fonts and images. Everything would then work perfectly.
I recommend not hosting the video on Infinityfree. Use a cdn. These guys recommend Clouflare.
And for the duration, duration doesn’t matter. The video should just not exceed 10 mb size.
On my site https://bluewinds.rf.gd/ you can inspect i have hosted nothing but scripts. Images are on cdn. The image folder is no longer used on my site.