How to rent referrals at neobux?

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Hello all. I wanted to know that how can i rent referrals at neobux. And I saw that page there to rent referrals, but did not find that for how much time these rented referrals work for us, once we purchase them. Like for renting 3 referrals, the amount is around $0.75. So once i pay $0.75 for these 3 referrals, then for what time will they work for me?? And can't i "buy" referrals instead of renting? How can these rented referrals be renewed and when do they have to be renewed. Kindly tell me about everything you know related to renting referrals at neobux, because I need help...