How long will the “VT-28” Cool Cube™ last? L How long will the “VT-28” Cool Cube™ last? The VT-28 when properly conditioned will last 103+ hours. Post navigationPrevious post: How long will the “VT-08” Cool Cube™ last?Next post: How do I condition the VT-03 for use? Leave a Reply Cancel replyYou must be logged in to post a comment.