Waste your time!

I read somewhere that doing nothing is NOT a waste of time. When I read this I had a hard time because I grew up in this busy era where you always have to be doing something. I've been learning how to meditate these days and I thought, what if I threw out all my clocks in the house? I wondered how I can handle this! So, what about you? Are you comfortable just sitting still for a whole day, without feeling guilty of "doing nothing"? How do you view time? Do you think there's such a thing as "wasting" it?