Vine length will depend on the variety of pumpkin that you are growing. Some larger ones can grow more than 30 feet long. Leaf size sounds about right. When the pumpkin(s) are about grapefruit size, many gardeners prune the main vine so that it is about 10 to 15 feet beyond the last fruit that one wants to grow on it. They also trim secondary vines back to about 10 to 12 feet from the main vine. (Burying the trimmed ends may help to discourage disease and insects.) Pruning the vine ends allows the plant to focus its energy on forming the fruit rather than growing more vine, and also allows the plant to fit better in smaller gardens.
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