Its still such a new product i doubt anyone will know for sure. Durability is also subjective so you wont get an accurate answer until you use it yourself and see.
To answer your question, I've seen 5050 "tail off" to about 75% in terms of peak optics (depth,wetness etc.) after roughly 6 weeks. Last week, we had 2 snow & ice storms blow through West Texas & finished off my 2 layers of 5050.
