Hi I recently ordered a YYF Hubstack (not the Afterglow…the regular one) and I was wondering what the sleep time was on this yoyo. This will be my first hubstacked yoyo! Thanks and have a great day! 
It REALLY depends on how good your throwing technique is and how cleanly you play.
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Around 4 minuets with a good throw but i wouldn’t count on that unless you have a relay great throw.