If you're going to do the cold plunge for the first time, maybe start it at 55/60 degrees and stay in a little longer. If you're going to be more experienced with this and you're more cold tolerant, try 45/50. And then if you're really aggressive and you want to try getting down into the, you know, low 40s or so, high 30s, well then make sure you have somebody there and make sure that you don't force yourself to do something that's going to cause tissue damage or cardiovascular damage.