In the end, the game is huge, and nearly everything in open-world PvE (except event chains) can be done in small chunks. Even some story missions. So there is certainly a lot for someone to do, and if you only play 30 mins/day you'll have a lot to do for a long time. It's probably worth the purchase price, especially if you're just trying out a new gamestyle, since this really is one of the most accessible MMOs to date.
The one thing that will eventually get you in the end, though, is when you get hooked on all the cool stuff you have time to do, and start to wonder about all the things you really don't. Dungeons, WvW, playing the TP, and even crafting are not really possible with 30 mins/day (yes, I know YOU can do them in 30 mins, but that's after 100s of hrs of playtime and practice), and eventually you'll want to do those things just to mess around with them. Even joining a guild isn't really something you can really do and get anything out of it. A friend of mine doesn't have more than 30 mins/day to try MMOs and he isn't interested in doing it because he knows it will suck him in and he'll never get out again.

Find content
Not Telling
