It was the tricorder and the communicator. I hastily put them together (not very well) and then it was time to go to my grandmothers house for Christmas lunch and to get presents from that side of the family. The drive usually took about an hour and a half.
We loaded the car and I placed my beloved new Star Trek props in their box under the front seat so that they would not slide around and get broken. Then, we left. It was a cold day (for the Tidewater) so we had the heat on and we were ready for some lunch and some presents. Then, we arrived at my grandmother's.
I ran around the car to grab the box from under the seat. That is when I noticed that the box was VERY hot to the touch. I had to get it out of the car and into the cold air to finally be able to handle it. I then opened it. And, learned a very important lesson about cars, and about tensile strength of plastics used for models.
Both models were partially melted. The communicator was almost completely ruined and the tricorder was warped so that I could not open the top. It also had a melted hole in one side of it. As you may imagine, my 9 year old self let out a wail that was heard for miles.
So, final lifespan? About two hours. The glue was not even dry when I put them in the car. It sure was by the time we arrived. 
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