With the holidays upon us, retailers are preparing their stores for an influx of returns. After all, not every gift is a keeper. Fortunately, the biggest online retailers have extended their return policies to deal with the deluge. Their different timelines vary considerably, so keeping track of it all can be a major headache. To save you the trouble, we've compiled the following list of all the major retailers' modified return policies for the holiday season. Whether you're returning a gift you bought for someone else or a gift you didn't like, these policies should help set things straight.