When you receive a Tulo mattress, it typically takes a few hours to expand to its full size after unpacking. It is common for the mattress to reach about 90 percent of its intended height within the first few hours. However, for the complete expansion to occur, it is usually recommended to allow 24 to 48 hours. This time frame can vary depending on factors such as room temperature and humidity levels. It is important to place the mattress on a solid foundation to ensure that it expands evenly and properly. As you allow your Tulo mattress to fully expand, you may notice any compressed packaging odors dissipating as well. For further details about care and maintenance of the mattress, one can refer to the Tulo website for specific guidance and recommendations.