Hi kazi,
Talalay latex in the western world will come from either Talalay Global or Radium, and it is one of the most durable foam comfort materials available. There is more about the different types and blends of latex and their relative properties and durability in this article and in post #6 here.
There are many factors involved in the durability of a mattress and the materials placed within. In this situation, we don’t have complete information about the makeup or use of the DIY mattress that was using this Talalay. I believe a completed mattress from Denver Mattress was used as the base, so the comfort layers used in that mattress will impact the durability and impressions. You’d also need to know the type of foundation used to see if that impacted durability. Also, the type of covering used over the latex will impact durability, so you’d need to consider that as well. Without getting too complicated, it’s also important to know that durability is relative to the person that sleeps on a mattress and no matter how durable the materials themselves may be … in practical terms a mattress will only last as long as it maintains the support, pressure relief, and personal preferences that allows someone to sleep well on a mattress. Foam softening or other changes in mattress materials or components may have different effects on different people and a mattress that has softened or changed to the degree that it no longer provides the support, pressure relief. or personal preferences for one person may still be fine for someone else. It’s usually not the final breakdown of materials that leads to the need to replace a mattress but the gradual loss of comfort and support that finally “crosses” a line and at some point is no longer suitable for that person to sleep on. Each person’s “line” can be very different. There’s much more information about mattresses and durability here if you’re interested, and I personally would not hesitate to recommend latex as a selection of a comfort layer within any mattress you may be considering.
Phoenix