The longest for me is about 4 hours and I can easily pass that time just listening to music and spacing out or talking. Just like any other car ride, really.
It's always sorta fun to play those car spotting games in groups though. Like spotting Minis or double letters/numbers on licence plates.
Future Cosplays (not working on yet):
Aradia Megido - 30%
Chihiro Fujisaki - 60%
God Tier Eridan - 50%
Asuka Langley Soryu - 90%
Monobear, Touko Fukawa, FLARP Eridan, Wonderful Cat's Life!Gumi, Emmy Altava, Shinji Ikari, Yotsuba, Toro Gijinka, Cirno, Neptune