To get to the Moon, it would take a month, instead of a couple of days. So if you’re a university or you have other things you want to be doing between here and the Moon, you could do that. But the trouble or drawback of chemical rockets is once you’ve done your burn, you’re done. Then you have to coast wherever you’re going. But with this solar sail, you get this push day and night. But wait, you’re in space, there’s no night! So you get a very continuous, small push indefinitely.