If you’re looking to collect every Wonder Seed, 10-flower coin, and get a perfect on every flagpole, you’re probably going to spend closer to 15 to 20 hours - or, given how difficult the Special World levels are, maybe even longer. If you’re going for the minimum number and just mainlining the story, it’ll take you a little less than 10 hours to finally beat Bowser and save the Flower Kingdom. You’ll need increasing numbers of them to unlock paths and levels in your quest to retrieve Royal Seeds and stop Bowser. Wonder, you’ll need to collect a series of Wonder Seeds. To progress through the main story worlds of Super Mario Bros.
