Technically (within the yogic meditation tradition), 'concentration' is defined as 12 seconds of one-pointed thought, ie the mind is fixed in one place. This is considered 1 unit of concentration.

'Meditation' is considered 12 units of concentration, so 12 * 12 seconds which is 144 seconds.

So technically, according to the definition of the old school meditators practicing 1000s of years ago, you are not really 'meditating' until the mind is fixed in one place for at least 144 seconds.