Disc golf takes less time to play than ball golf. There are a couple of reasons for this. First, and most importantly, an average disc golf hole is only about one third as long as the average hole of ball golf. The holes are shorter because golf discs only go one third as far as golf balls. While a hole's length in disc golf is measured in feet, a hole of ball golf is measured in yards. Consequently, a round of disc golf only takes about a third as long as a round of ball golf.
Another reason that disc golf is faster is that you don't need to spend time studying the green as in ball golf. You just need to check the wind, line up your putt and go for it. In fact, you only have 30 seconds from the time you reach your lie to make your putt, but I have never seen this rule enforced because it is rarely an issue.
One more reason that disc golf takes less time is because you usually don't have to wait behind other groups. Most courses I have played have only had a few players on the entire course. This is not always the case, but in my experience it is almost always the case.
Since it takes less time, disc golf is a much more accessible sport for most people. If I have a spare half hour before work or on my lunch break I can play nine holes of disc golf. It is a much better sport for a family man in my opinion because it doesn't take me away from my family as much. Plus I end up taking my family along with me some of the time (they don't share my passion for disc golf, but they humor me).