New Contacts - Focus Night and Day

So I got my Focus Night and Day contacts from my eye doctor. He said to wear them for a week and see how they do. If they aren't any good, then I can try Purevision contacts which are also made for 30 day continuous wear. I'm like koo. I've been wearing Focus Monthly lenses, which you take out every night to clean, for like 6 months and they are the best lenses I've ever tried. I figured Focus Night and Day would be the way to go. Only problem is that they are made to wear for 30 days straight and I've been wearing them for like 3 hours and they are bothering the hell out of me. They hurt after like an hour and a half of wear. Then they go awhile and don't hurt. Then they are back to hurting. I'm like WTF yo. 30 days and I can't wear them for 30 minutes? That can't be right. They are FOCUS just like the ones I like so I dunno what the problem is. I'm going to try to keep them in all day and sleep in them tonight, but if they hurt too bad I'm going to have to try the Purevision next week. I'll let you know how it goes.