How long will the “FT-96” Cool Cube™ last? L How long will the “FT-96” Cool Cube™ last? The VT-28 when properly conditioned can hold product between -50 to -15°C for 139+ hours. Post navigationPrevious post: How to connect a Data Logger to a report that is downloaded from it, for tracing purposes.Next post: How long will the “VT-96” Cool Cube™ last?