Time together= those codependent people who insist on spending every waking moment together. I read a thread on a gay forum where someone write a VERY long rant about his boyfriend, (who's on 2 swim teams, working, and going to school) not texting him 30 times a day. These people are VERY annoying, insecure, and controlling. I avoid them at all costs.
Quality time=appreciating your time with your partner and making the most out of it. You may not see them a lot, but when you do you're enjoying their company and paying attention to them instead of your Blackberry. Quality time is making memories whether it's cuddling on the couch watching movies or fucking like rabbits at the beach or visiting a foreign country together or having dinner with your partner's parents.