"You all need to stand at a hand's length apart from each other."
Is this acceptable?
It sounds a little unnatural, because it's so close for people standing together. An arm's length apart is commonly used in that situation.
I'd prefer to use 'a hand's length/width' for aligning smaller items. For even smaller items, you might use a 'finger's width' apart. Note that a hand's width will be less than a hand's length. The average human hand is about twice as long as it is wide.
Please line the jars up a hand's width apart.
Make sure the headset microphone is about two finger widths from your lips.
It's correct but no more natural than the sentence with 'breadth'.
"You all need to stand an arm's breadth apart from each other."
Please pour me two fingers of bourbon.
Neat, or on the rocks?
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