What would being without duration amount to? What, for that matter, would intensity refer to, if it didn’t endure for a spell? “More than an hour” is nothing compared to what the Buddha did. If you are referring to enlightenment, you have missed the point of training the mind. I’ve never met anyone with developed muscles, who only ‘worked out’ for a few minutes. Is the mind easier than muscles? Training the mind creates the conditions for enlightenment to spontaneously occur. But in the meantime, while waiting for that to come to fruition, having a trained mind means not suffering any longer because you are unaffected by what arises. That’s the value of mind- training. And that takes time.