how long will pipe tobacco last in a ziplock bag

 This is a difficult question to answer without knowing more about the pipe tobacco in question. Generally, pipe tobaccos are composed of several different types of leaves, and each variety has a different moisture content. Some tobaccos will dry out quickly if not stored properly, while others will last for weeks or even months.

A good rule of thumb is to keep pipe tobacco in an airtight container, like a zip-lock bag, and to store it in a cool, dry place. If the tobacco is kept in this type of environment, it should last for several weeks or months.

The longevity of pipe tobacco stored in a ziplock bag will depend on the climate and storage conditions. In a cool, dry place, it could last for up to six months. However, if it's stored in a warm, humid environment, the tobacco could spoil in as little as two weeks.

 this question as it will depend on a number of factors, including the quality of the tobacco, the environment in which it is stored, and the type of bag used. Generally,  tobacco pipe will last for several months if stored in a cool, dry place in a resealable bag.