In my experience I think I forget time but I can never be sure because as soon as there is an assessment of time the past distorts the present and the future comes pouring in. Time must be like the mother of all concepts. It certainly is not an ordinary run of the mill concept.
"Beautifully taught is the Lord's Dhamma, immediately apparent, timeless, of the nature of a personal invitation, progressive, to be attained by the wise, each for himself." Anguttara Nikaya V.332