Could one make spiritual progress by having a week of solid meditation?
Then more mental asylums would have to be opened. It is not possible. Only spiritual Masters can meditate for hours and days on end. Ordinary seekers have to talk and mix with people and engage in outer activities. Otherwise, the mind and nerves become very agitated. Then anger comes forward, and also a kind of subtle pride that you have been extremely spiritual for a whole week. Then the seeker becomes abnormal.
Meditating for eighteen or twenty hours a day is possible, but only when you are on the verge of realisation or after you realise God. At that time you will have acquired the capacity. But now if you try it, you will only go crazy.
Do you need happiness? Then do just three things: Meditate regularly. Smile soulfully. Love untiringly.