When you invest your time, you make a goal and a decision of something that you want to accomplish. Whether it's make good grades in school, be a good athlete, be a good person, go down and do some community service and help somebody who's in need, whatever it is you choose to do, you're investing your time in that.
Once again, we are reminded that awakening, or enlightenment is not the property of Buddhism, any more than Truth is the property of Christianity. Neither the Buddha nor the Christ belongs exclusively to the communities that were founded in their names. They belong to all people of goodwill, all who are attentive to the secret which lives in the depths of their breath and their consciousness. (14)