I don't really see what's the big deal. it's not making the dungeons shorter or anything. If it take 20 runs at 1 hour each to get the items you want, you'll spend 20hours in the dungeons. Be it in 1 day or 1 month, it'll still be 20 hours. The hours in dungeons and doing something else is still the same.

It's as if I was comparing 2 games that were about 40 hours long, first one finished in 2 week during the summer when i have more free time and the second one finish in 2 month during school. I won't be thinking that the first one was way too short, only 1 week worth of playtime while the second one was a way better purchase, 2 months of playtime. In the end they both took about the same time.