How long can chaeto algae and pods last in a car?

I'm planning to buy Chaeto algae and pods today. However, they will stay in my car for a good 6 hours until i get off work and bring them home. Will they survive with ease? The weather is about 10 degree celsius, with little sun. It's my first time with Chaeto and Pods. I just set up my refugium/sump 2 days ago, and i have a 50 gallon FOWLR. Planning to harvest Pods with the intention to get a Mandarin in a year. Currently have 4 little clowns, 1 watchman goby, 1 royal gramma and 1 blue yellow tail damsel. Already put few mangrove with no roots hanging in the sump. If I can get rid of all my nitrate using these plants, then I'd start thinking about corals. It's at 20ppm right now. Any advice is appreciated. My 10-gallon sump is actually at the bottom back of the tank, not inside the stand. Wondering if natural light will be enough to grow them. Not planning to go DSB. Thanks!