I've funded a few projects. The money goes through as soon as the funding period is over assuming the project has surpassed it's funding goal. I've funded 9 projects and received 6 rewards (just checked). Two of the last three are from the last six months and still in progress (one is an apology for being late with an excuse of the creator quitting his job and moving) and the last was a project that launched but I never received the reward on my funding level (not that I care all that much, as it was a series of letterpress postcards).