The tightrope and the trapeze I could do. You know, after a few tries. The Double-or-nothing, where you let it wrap around once before you catch it was trouble. And the Braintwister, where you hook the string under the sleeping yo-yo and then do a little circle with it, then release it to finish out with a loop was tricky. I haven’t tried it since I’ve had these fancy new yo-yo designs to play with, though. These mothers sleep!
Yeah, I was reading some Youtube comment or another and it named some brand that sleeps from 1-5 minutes. Is that remotely true? I think the most I got out of my regular Duncan yo-yos was about 10-15 seconds. Maybe 20, but that seems really long.
In those contests from my grammar school days my memory is that the winner of that section was one that had a clean return to his hand (it may have been a her but I doubt it) after 60 seconds. The equipment in those days, even with a paraffin waxed string, kept kids from going much longer. I don’t remember what the World Record was for a sustained Spinner, but there was one.
In a search for world record yo-yo accomplishments I found Yo Yo World Recordsso maybe there are other similar sites.
See also: http://www.yo-yos.net/world%20records.htm
Longest Sleeper (fixed axle to extinction). Open Tim Redmond
USA
34 3min
51.54 seconds
PA State Pro-Am
12/13/09
YoYoJam DJ
Junior John Narum 11 2min
39.42 seconds
7/28/05
World Yo-Yo Championships in Orlando, FL
YoYoJam DJ
Masters Jim E Johnson
USA
61 2min
39.42 seconds
8/04/07
World Yo-Yo Championships Orlando, FL
YoYoJam DJ
Good thing I moved on to the my next hobby/diversion. 
For me, when Duncan came out with the Butterfly yo-yoit changed yo-yo-ing forever, and for the better. A beginner could pick up a Butterfly and be doing tricks within minutes over the old fashioned spool type.
Also, sort of like the joy of using all of the ink in ball point pen. There’s was nothing quite like using a yo-yo enough so that you had to replace the string. It was 10 year old kid’s version of disassembling an AK-47 and cleaning it up and putting it together with new parts. 
I loved putting a waxy new string on my yo-yo.
I picked it up in college. Can still walk the dog and rock the baby.
Sylvester Stallone likes “Yo! Yo!” s
If I have one that spins on two different axes, would it be a Yo Yo Yo ?
It is if you get the meme to catch. Go, man!
But as I understand it, though the toy is believed to have originated as a Philipino weapon (pictures suspected of being such a toy found on Greek vases notwithstanding), the lore is that the name comes from the Chinese meaning “come-come”.
The only “trick” I know of that loosens the string is Sleeping Beauty.
That’s the one.
Inside loops will tighten the string. Outside loops will loosen it.
Yep, that’s what I remember. You had to alternate those if you wanted to hold the same tension you started with on the string.
See, I found the Duncan Imperial much easier to deal with. The Butterfly just slept like crap, from what I remember–at least I couldn’t get it to sleep anywhere near as long as just the standard Imperial.