Well, I asked about it to the staff and they answer me quite fast
They answer that their funds (or plans) can't be long as they are unlimited (so the period could be as short or long the investor like, but if your money is giving you more money I don't think people invest for short periods) and payments as I have seen are every trading day (You don't have to wait a month, neither a year)
The fact is that, more than the plans, I believe the persons behind. Because their other funds has been giving us quite good results since last year. Just were two months that we got less than 16% monthly but they paid us anyway taking money from their guarantee fund.
I hope they have success with their new online project.