If you want to apply the meaning of the dharma to this life,
it is not about the quantity of dharma but about actually putting it into practice. If you practice dharma for your own sake, then it is no longer dharma. Thus, even if you don't have the time to recite the Mani mantra hundreds of thousands of times, if you have recited it just once with a mind that thinks of benefiting others, then you will have accomplished something meaningful.