"I can watch a video on to pack a pipe..... "
Yes Bowie, but for hours on end as the OP states?
"For example, you and I both share an interest in shortwave radio listening. I learned the basics about the various SW bands and their uses in less than an hour...... "
Believe me Bowie, if I were to quiz you on SW amateur bands V broadcast frequencies, propogation, ionospheric disturbances your knowledge gained in your stated under 60 minutes would soon crumble. It takes years to get it all sorted in your head so that it becomes second nature and even then there are the sunspot variables plus much more.
Watching something being done is most useful yes, but it is best when one is able to discuss matters with someone in the know, the more the better.
Now in bed so.....night night all ?
Regards,
Jay.?