Yeah, they're laughable. If you do them every day, you get 49 seals a week, which means it would take you:

4 weeks to get 1 Alexandrite (this one is particularly crazy)
2,5 months to get enough logs for 1 Oil of time
3,5 months to get enough logs for 1 Sands of time

I know Yoshida wanted this to be an option for those of us who don't have unlimited amount of time, but this is way too harsh in my opinion. Especially when you consider that the time it will take you to get 1 sands of time, the next patch will have (most likely) hit and new and better gear/gear of the same lvl that are easier to obtain will be available.