Ah okay. Well, I am open to people transferring rewards to others, but it's up to you if you want to go through that hassle for the rewards/discount.
The timer is a site rule. The creator asks for a certain amount of funding from the public in order to finish their product (in exchange for a future copy of that product and often added rewards/discounts). If the funding goal is met (or exceeded) on the end date, then the creator receives the pledged funding to finish their project. And if the goal is not met, then they don't and backers do not pay anything. That part is good for backers, because it lowers the change of underfunded doomed projects. Overall it's a nice setup where the dev can get funded without greedy companies or loans. And the backers get nice quirks, rewards and discounts. Just make sure you trust the developer to actually deliver on their promises.
The 30 days time limit is pretty common. Maybe because some people live paycheck to paycheck or something. I'm not really sure.