What do we mean when we say that time is dear, or that something costs to much time? Do we simply mean that we don't want to devote however much time we think it will take to whatever it is we were thinking about doing? I highly doubt that we are thinking about the fact that we have a limited amount of time in this life and there for must use it wisely. Time is our allowance from eternity, portioned out to us while we are here in this unglorified mortal body. And it really is limited, when you think about it. A friend of mine was telling my about his plans to hike the Pacific Coast Trail from Mexico to Canada the summer after he graduates here. He is expecting it to take four months and he is so very stoked, he positivly glows while he is talking about it. But he knows that if he does not do it that summer, then he never will. Time is funny like that, it never comes back to where it was, and while there is more of it in front of you, as far as you can tell, but you can't keep pushing back the things you want to do.
Tempus fugit, take it, live. If you are willing to take advice from one who is still figuring all this out.