This site uses an auction-based player draft, and your league can take as long as you'd like to run your auctions - hours, days, weeks. Because it's an auction-based system, your team owners can take their time bidding, but they have to focus on player salaries/bids to stay within their budget. Player auctions run for the amount of time that your commissioner sets, and all teams have unlimited chances to bid - as long as they have the funds available, and as long as the auction clock is still running.