I usually do not comment but i was weirded out with the file count (i know it is just a meme, and not serious, but lets assume that), then average file size is

28.9*1024MiB/14690 = 2.014540504MiB

(this assumes it is a standard windows install where windows counts in binary system, and represents with decimal units, but even if it actual GBs and GiBs, the error is small)

lets assume it is 144p (i usually watch yt at that), and lets assume you have it all in great cpu AV1, and lets take a typical yt bitrate at that quality (and lets assume its video only) 100 kbps

then average duration of a file is

2.014540504*1024*8kb/100kbps = 165.0311581s

so that is a little less than 3 mins (assume video bitrate stays constant throughout, which is definitely not true but easy to calculate)

and just for completeness, lets calculate the amount of total time to “watch’m all”

165.0311581*14690/(60*60*24) = 28.05911704

so that is a little over 28 days (i was expecting less, but then again, just a meme)

Edit: i left out the possibility of images, if that is the case, it is technically 0 time, but at the same time, a good JXL 2 MiB image is pretty good quality