Authorization holds generally only last 1-5 days (there are special rules for some industries that let them do it longer) -- Kickstarter is probably just doing

Authorization holds generally only last 1-5 days (there are special rules for some industries that let them do it longer) -- Kickstarter is probably just doing a quick $0 auth to check if the card is valid and storing it to auth & capture again when the project is committed. They're not holding an auth for your commitment the whole time. That'd tie up money/credit in your account for a project that might not ever be funded.