test storage

So the family and I will be going on a road trip soon, and there will be days where my testosterone vials will be sitting in the car for a full 8 hours while we're exploring amusement parks and such. Is there any issue with this? If so, any tips to deal with it? Would it be better for it to be...

What is the recommended way to store testosterone base powder? I have been storing it in the freezer but I am not sure if that is detrimental to the product.

Searched and couldn’t find this, sorry if it exists. What’s the best way to store test long term? Freeze it? How long is a 10ml vials shelf life? Could it be frozen for two years and then thawed?