30 mins max nibblet.
1hp should be more than enough, it's only a 4lt bucket.
You'd need to get the speed down, that's the main thing, otherwise it does not tumble, only sticks to the side of the bucket
There is an interesting clip on YouTube about a DIY sonic setup made by bungee-ing a 1/4 sheet sander to the side of a flat sided bucket.
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