fewer / less

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Use fewer when referring to countable objects.

Use less when referring to abstract, inseparable, continuous, or otherwise uncountable quantities.

Yes:

You need fewer components to assemble device A than you need to assemble device B.

Yes:

You need less time to assemble device A than you need to assemble device B.

Yes:

The fewer devices you connect, the less cable you need.

(Applies if the cable is on a drum and you need to cut it off.)

Yes:

The fewer devices you connect, the fewer cables you need.

(Applies if you already have discrete, ready-to-use, short cables.)